UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

For the quarterly period ended SeptemberJune 30, 20172018

OR

Commission FileNo. 001-35456

ALLISON TRANSMISSION HOLDINGS, INC.

(Exact Name of Registrant as Specified In Its Charter)

(317)242-5000

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of RegulationS-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, anon-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” inRule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ☐

Indicate by check mark whether the registrant is a shell company (as defined inRule 12b-2 of the Exchange Act).     Yes  ☐    No  ☒

As of October 17, 2017,July 16, 2018, there were 141,760,746130,467,369 shares of Common Stock outstanding.

INDEX

1

PART I. FINANCIAL INFORMATION

Allison Transmission Holdings, Inc.

Condensed Consolidated Balance Sheets

(unaudited, dollars in millions, except per share data)

The accompanying notes are an integral part of the condensed consolidated financial statements.

2

Allison Transmission Holdings, Inc.

Condensed Consolidated Statements of Comprehensive Income

(unaudited, dollars in millions, except per share data)

The accompanying notes are an integral part of the condensed consolidated financial statements.

3

Allison Transmission Holdings, Inc.

Condensed Consolidated Statements of Cash Flows

(unaudited, dollars in millions)

The accompanying notes are an integral part of the condensed consolidated financial statements.

4

Allison Transmission Holdings, Inc.

Notes to Condensed Consolidated Financial Statements

(UNAUDITED)

Overview

Allison Transmission Holdings, Inc. and its subsidiaries (“Allison” or the “Company”) design and manufacture commercial and defense fully-automaticfully automatic transmissions. The business was founded in 1915 and has been headquartered in Indianapolis, Indiana since inception. Allison was an operating unit of General Motors Corporation from 1929 until 2007, when Allison once again became a stand-alone company. In March 2012, Allison began trading on the New York Stock Exchange under the symbol, “ALSN”.

The Company has approximately 2,6002,700 employees and 13 different transmission product lines. Although approximately 78%79% of revenues were generated in North America in 2016,2017, the Company has a global presence by serving customers in Europe, Asia, South America and Africa. The Company serves customers through an independent network of approximately 1,400 independent distributor and dealer locations worldwide.

Basis of Presentation and Principles of Consolidation

The condensed consolidated financial statements have been prepared in accordance with accounting principles for interim financial information and with the instructions to Form10-Q and Article 10 of RegulationS-X. Accordingly, the condensed consolidated financial statements do not include all information and footnotes required by accounting principles generally accepted in the United States of America (“GAAP”) for complete financial statements. The information herein reflects all normal recurring material adjustments, which are, in the opinion of management, necessary for the fair statement of the results for the periods presented. The condensed consolidated financial statements herein consist of all wholly-owned domestic and foreign subsidiaries with all significant intercompany transactions eliminated.

These condensed consolidated financial statements present the financial position, results of comprehensive income and cash flows of the Company. The condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements included in the Company’s Form10-K for the year ended December 31, 20162017 as filed with the Securities and Exchange Commission (“SEC”) on February 24, 2017. The presentation of certain prior year disclosures has been modified to conform to the current year presentation, as commencing in the first quarter of 2017, the Company elected to report financial data in whole millions of dollars, except as otherwise noted.15, 2018. The interim period financial results for the three and ninesix month periods presented are not necessarily indicative of results to be expected for any other interim period or for the entire year.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities and the reported amounts of revenue and expenses. Estimates include, but are not limited to, sales allowances, government price adjustments, fair market values and future cash flows associated with goodwill, indefinite life intangibles, long-lived asset impairment tests, useful lives for depreciation and amortization, warranty liabilities, environmental liabilities, determination of discount and other assumptions for pension and other postretirementpost-retirement benefit expense, income taxes and deferred tax valuation allowances, derivative valuation and contingencies. The Company’s accounting policies involve the application of judgments and assumptions made by management that include inherent risks and uncertainties. Actual results could differ materially from these estimates. Changes in estimates are recorded in results of operations in the period that the events or circumstances giving rise to such changes occur.

5

Impairment of Assets

During the fourth quarter of every year, the Company performs additional reviews of its goodwill, other intangible assets and long-lived assets to determine whether the carrying value of an asset may not be recoverable. The Company has recorded impairments to both its Trade name and long-lived assets in prior periods with the most recent impairments recorded in 2015.

The Company performs its annual goodwill and intangible assets impairment analysis on October 31 of every year. Events or circumstances that could unfavorably impact the key assumptions in the impairment test include lower net sales, the Company’s inability to execute on marketing programs and/or delay in the introduction of new products, lower gross margins or failure to obtain forecasted cost reductions, or a higher discount rate as a result of market conditions.

The carrying value of long-lived assets is evaluated when events or circumstances indicate that there has been a significant change in the use of an asset, or the planned sale or disposal of an asset. The asset would be considered impaired when there is no future use planned for the asset or the future net undiscounted cash flows generated by the asset or asset group are less than its carrying value. An impairment loss would be recognized based on the amount by which the carrying value exceeds fair value. Assumptions and estimates used to determine cash flows in the evaluation of impairment and the fair values used to determine the impairment are subject to a degree of judgment and complexity. Any changes to the assumptions and estimates resulting from changes in actual results or market conditions from those anticipated may affect the carrying value of long-lived assets and could result in an impairment charge.

Recently Adopted Accounting Pronouncements

In JanuaryAugust 2017, the Financial Accounting Standards Board (“FASB”) issued authoritative accounting guidance on evaluation of goodwillaccounting for impairment. Thederivative and hedge instruments. Among other things, the guidance modifiesallows the approachinitial hedge effectiveness assessment to assessing impairment from testingbe performed by the implied fair value goodwill to testing the fair valueend of the reporting unit carryingquarter in which the goodwill, which eliminates Step 2hedge is designated, permits a qualitative assessment for certain hedges if an expectation of high effectiveness can be supported throughout the term of the current evaluation guidance. The intent of this amendmenthedge, and removes the requirement to record ineffectiveness on cash flow hedges immediately through earnings when the hedge is to reduce the cost and complexity of evaluating goodwill.highly effective. The guidance was early adopted by the Company effective JulyApril 1, 2017. The adoption of this2018 and applied upon entering into interest rate swaps designated as cash flow hedges during the period ended June 30, 2018. When adopted in an interim period, the guidance did not have an impact on the Company’s consolidated financial statements.

In March 2016, the FASB issued authoritative accounting guidance on share-based payment awardsis required to employees. The guidance involves several aspectsbe reflected as of the accounting for share-based payment transactions, includingbeginning of the income tax consequences, classificationyear of awardsadoption. The Company has not previously designated any derivative instruments as either equity or liabilities,hedging instruments, and classification onthus, the statement of cash flows. The guidance was adopted by the Company effective January 1, 2017. Management recorded an excess tax benefit of $5 million and $16 million to income tax expense and as a component of operating cash flows for the three months and nine months ended September 30, 2017, respectively, and made the accounting policy election to account for forfeitures as they occur.

In July 2015, the FASB issued authoritative accounting guidance to simplify the measurement of inventory. The guidance requires that inventory be measured at the lower of cost and net realizable value. When evidence exists that the net realizable value of inventory is lower than its cost, the difference shall be recognized as a loss in earnings in the period in which it occurs. Inventory measured using last-in,first-out and the retail inventory method are not impacted by the new guidance. The guidance was adopted by the Company effective January 1, 2017. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

Recently Issued Accounting Pronouncements

In May 2017, the FASB issued authoritative accounting guidance on accounting for modifications to the terms of employee stock compensation. The guidance clarifies which changes to terms or conditions of share-based payment awards require the entity to apply modification accounting. The guidance will be effective forwas adopted by the Company in fiscal yeareffective January 1, 2018 but early adoption is permitted. Management is currently evaluating theand did not have a material impact of this guidance on the Company’s consolidated financial statements.

In March 2017, the FASB issued authoritative accounting guidance on the presentation of net periodic pension costs and net periodic postretirementpost-retirement benefit costs. The guidance clarifies the presentation of component costs within an employer’s financial statements and restricts component costs eligible for capitalization to the service cost component. The guidance was adopted by the Company effective January 1, 2018 and did not early adopt, therefore the guidance will be effective for the Company in fiscal year 2018. Management is currently evaluating thehave a material impact of this guidance on the Company’s consolidated financial statements.

In October 2016, the FASB issued authoritative accounting guidance on the income tax consequences of intra-company transfers other than inventory. This guidance addresses the timing of the recognition of current and deferred income taxes. Under this guidance, the recognition of current or deferred income taxes will occur at the time of the transfer of the asset. The Company did not early adopt; therefore, the guidance will be effective for the Company in fiscal year 2018. Management is currently evaluating the impact of this guidance on the Company’s consolidated financial statements.

6

In August 2016, the FASB issued authoritative accounting guidance on the presentation and classification of certain cash receipts and cash payments on the statement of cash flows. The guidance specifically addresses cash flow issues with the objective of reducing the diversity in practice. The guidance was adopted by the Company effective January 1, 2018 and did not early adopt; therefore, the guidance will be effective for the Company in fiscal year 2018. Management is currently evaluating thehave a material impact of this guidance on the Company’s consolidated financial statements.

In February 2016, the FASB issued authoritative accounting guidance on lease accounting. The guidance requires lessees to presentright-of-use assets and lease liabilities on the balance sheet for all leases not considered short-term leases. Short-term leases are leases with a lease term of 12 months or less as long as the leases do not include options to purchase the underlying assets that the lessee is reasonably certain to exercise. The new guidance also introduces new disclosure requirements for leasing arrangements. The guidance will be effective for the Company in fiscal year 2019, and the Company does not plan to early adopt. Management is currently evaluating the impact of this guidance on the Company’s consolidated financial statements.

In January 2016, the FASB issued authoritative accounting guidance on the classification of equity securities with readily determinable fair values into different categories (e.g. trading oravailable-for-sale) and the requirement for equity securities to be measured at fair value with changes in fair value recognized in net income. The Company did not early adopt; therefore, the guidance will be effective prospectively for the Company in fiscal year 2018. Upon adoption, a cumulative-effect adjustment to retained earnings in the consolidated balance sheets will be reclassified to beginning retained earnings. Management has evaluated the impact of this guidance and expects the unrealized gains and losses for fair value measurement of the Company’savailable-for-sale securities to be recognized in net income upon adoption.

In May 2014, the FASB issued authoritative accounting guidance on a company’s accounting for revenue from contracts with customers, which guidance haswas subsequently been amended. The guidance applies to all companies that enter into contracts with customers to transfer goods, services or nonfinancial assets. The guidance requires these companies to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also requires disclosures regarding the nature, timing, amount and uncertainty of revenue that is recognized. The guidance allows either full orwas adopted by the Company effective January 1, 2018 on a modified retrospective adoption.basis. See Note C, “Revenue” for information regarding the impact of the adoption of this guidance.

Recently Issued Accounting Pronouncements

In June 2018, the FASB issued authoritative accounting guidance on accounting for nonemployee awards for goods or services received by a company. The Company did not early adopt; therefore, the guidance will be effective for the Company for the annual and interim periods beginning in fiscal year 2018.2019, but early adoption is permitted. Management is currently evaluating the impact of this guidance on the Company’s consolidated financial statements.

In February 2018, the FASB issued authoritative accounting guidance on transfers of stranded balances in accumulated other comprehensive loss to retained earnings. The passage of the U.S. Tax Cuts and Jobs Act by the U.S. federal government in December 2017 and existing GAAP requirements to adjust deferred tax assets and liabilities for changes in tax laws or rates created stranded balances in accumulated other comprehensive loss on deferred tax assets and liabilities previously recorded as a component to accumulated other comprehensive loss. The guidance applies to companies affected by these stranded balances and allows a reclassification of these balances to retained earnings. The guidance will be effective for the Company in fiscal year 2019, but early adoption is permitted. The guidance can be applied either in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate in the U.S. Tax Cuts and Jobs Act is recognized. Management is currently evaluating affected balances recorded in accumulated other comprehensive loss and expects the impact of this guidance on the Company’s consolidated financial statements to be an immaterial adjustment to retained earnings.

In February 2016, the FASB issued authoritative accounting guidance on lease accounting. The guidance requires lessees to presentright-of-use assets and lease liabilities on the balance sheet for all leases not considered short-term leases. Short-term leases are leases with a lease term of 12 months or less as long as the leases do not include options to purchase the underlying assets that the lessee is reasonably certain to exercise. The guidance also introduces new disclosure requirements for leasing arrangements. The guidance will implementbe effective for the Company in fiscal year 2019 using a modified retrospective approach. Management is currently evaluating the Company’s lease contracts and assessing the impact of the adoption of policy elections and practical expedients prescribed by the guidance. Management does not expect the adoption of this guidance to have a material impact on the Company’s consolidated financial statements.

Adoption of New Revenue Guidance

New authoritative accounting guidance for revenue was adopted by the Company effective January 1, 2018 using the modified retrospective approach. Management has determined thatCurrent period results are presented in conformity with the new authoritative accounting guidance, while prior period results are presented in conformity with prior accounting guidance.

In accordance with the modified retrospective approach, the Company recorded aone-time adjustment related to sales of Extended Transmission Coverage (“ETC”) contracts open as of the date of adoption, which increased opening retained earnings by $5 million, net of tax, and decreased current deferred revenue streams that will beby $2 million andnon-current deferred revenue by $4 million as of January 1, 2018.

During the three months ended June 30, 2018, neither net sales nor deferred revenue were impacted by the guidance relate toapplication of this guidance. During the six months ended June 30, 2018, the Company increased net sales by $1 million, and decreasednon-standardnon-current transmission coverages. Certain contracts are also being reviewed individually for the potential impact. No significant changes or additionsdeferred revenue by $1 million, compared to our internal controls over financial reporting are expectedprior accounting guidance, as a result of implementinghow the Company allocates revenue to the ETC performance obligation in certain contracts under the new authoritative accounting guidance for revenue.

Under the new authoritative accounting guidance, revenue is recognized as each distinct performance obligation within a contract is satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. The Company enters into long-term supply agreements (“LTSAs”) and distributor agreements with certain customers. The LTSAs and distributor agreements do not include committed volumes until underlying purchase orders are issued; therefore, the Company determined that purchase orders are the contract with a customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when the performance obligation is satisfied, as there is no right of return.

Many of the Company’s contracts have a single performance obligation, as the promise to transfer the individual good or service is not separately identifiable from other promises in the contracts and is, therefore, not distinct. Some of our contracts have multiple performance obligations, most commonly the sale of both a transmission and ETC. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using a ratable allocation based on the standalone selling price of each distinct good or service in the contract.

The Company may also use volume based discounts and rebates as marketing incentives in the sales of both transmissions and service parts, which are accounted for as variable consideration. The Company records the impact of the incentives as a reduction to revenue when it is determined that the adjustment is not likely to reverse, historically on a quarterly basis. Due to the typically short duration of purchase orders and minimal number of open contracts with variable consideration at any point in time, the impact of variable consideration is immaterial. If it were to become material, the Company would explain the methods, assumptions and estimates used to determine the consideration allocated to each performance obligation. The Company estimates the impact of all other incentives based on the related sales and market conditions in the end market vocation.

Net sales are made on credit terms, generally 30 days, based on an assessment of the customer’s creditworthiness. For certain goods or services, the Company receives consideration prior to satisfying the related performance obligation. Such consideration is recorded as a contract liability in current andnon-current Deferred Revenue as of June 30, 2018 and December 31, 2017. See Note J, “Deferred Revenue” for more information including the amount of revenue earned during the three and six months ended June 30, 2018 that had been previously deferred. The Company does not have contract assets.

Disaggregated Revenue

The Company has one operating segment and reportable segment. The Company is in one line of business, which is the manufacture and distribution of fully automatic transmissions. The following presents disaggregated revenue by categories that best depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors (dollars in millions):

Disaggregated revenue by end market is further described as follows:

North AmericaOn-Highway

Revenue from the North AmericaOn-Highway end market is driven by the sale of transmissions to original equipment manufacturers (“OEMs”), distributors and dealers that install the transmission intoClass 4-5,Class 6-7 and Class 8 straight trucks and metro tractors, conventional transit, shuttle and coach buses, school buses and motorhome applications. Revenue from the North AmericaOn-Highway end market also includes the sale of electric hybrid-propulsion systems for transit bus. Revenue is recognized at the point in time when control passes to the customer, which is based on shipping terms when the order is fulfilled by the Company.

North AmericaOff-Highway

Revenue from the North AmericaOff-Highway end market is driven by sales of transmissions to OEMs and distributors that serve end users who operate vehicles and auxiliary equipment in energy, mining and construction applications. Revenue is recognized at the point in time when control passes to the customer, which is based on shipping terms when the order is fulfilled by the Company.

Defense

Revenue from the Defense end market is driven by sales of transmissions to the U.S. Government or its contractors and sales to certain government contractors outside of North America for use in both wheeled and tracked defense vehicle applications. Revenue is recognized at the point in time when control passes to the customer, which is based on shipping terms when the order is fulfilled by the Company.

Periodically, the Company and the U.S. Government will enter into abill-and-hold arrangement where a completed transmission physically remains at the Company’s facility at the request of the U.S. Government. Revenue is recognized at the point in time when it is determined that the U.S. Government accepts the transmission and is able to direct its use.

Outside North AmericaOn-Highway

Revenue from the Outside North AmericaOn-Highway end market is driven by the sale of transmissions to OEMs and distributors that produce vehicles for commercial users in medium and heavy duty applications. Revenue is recognized at the point in time when control passes to the customer, which is based on shipping terms when the order is fulfilled by the Company.

Outside North AmericaOff-Highway

Revenue from the Outside North AmericaOff-Highway end market is driven by sales of transmissions to OEMs and distributors serving end users who operate vehicles and auxiliary equipment in energy, mining and construction applications. Revenue is recognized at the point in time when control passes to the customer, which is based on shipping terms when the order is fulfilled by the Company.

Service Parts, Support Equipment and Other

Revenue from the Service Parts, Support Equipment and Other end market is primarily derived from the sale of transmission parts and fluid purchased for the normal maintenance and repair needs of products in service and the sale of ETC contracts which extend the warranty coverages of transmissions beyond the standard warranty period.

Revenue is recognized on sales of service parts and support equipment at the point in time when control passes to the customer, which is based on shipping terms when the order is fulfilled by the Company.

Revenue from the sale of ETC contracts is recognized ratably over the time period that corresponds with the period of coverage, as the Company has determined this guidance.method best depicts the progress towards satisfaction of its performance obligation. ETC contracts are sold in one to five year durations within the North AmericaOn-Highway, Outside North AmericaOn-Highway, North AmericaOff-Highway and Outside North AmericaOff-Highway end markets. The ETC contract period begins when the standard warranty coverage period ends. All consideration allocated to an ETC performance obligation is initially deferred until the coverage period begins.

Inventories consisted of the following components (dollars in millions):

Inventory components shipped to third parties, primarily cores, parts tore-manufacturers, and parts to contract manufacturers, which the Company has an obligation to buy back, are included in purchased parts and raw materials, with an offsetting liability in Other current liabilities. See NOTE J,K, “Other Current Liabilities” for more information.

7

As of SeptemberJune 30, 20172018 and December 31, 2016,2017, the carrying amount of the Company’s Goodwill was $1,941 million.

The following presents a summary of other intangible assets (dollars in millions):

As of SeptemberJune 30, 20172018 and December 31, 2016,2017, the net carrying value of ourthe Company’s Goodwill and otherOther intangible assets, net was $3,116$3,050 million and $3,183$3,094 million, respectively.

Amortization expense related to other intangible assets for the next five fiscal years is expected to be (dollars in millions):

In accordance with the FASB’s authoritative accounting guidance on fair value measurements, fair value is the price (exit price) that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company utilizes market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs can be readily observable, market corroborated, or generally unobservable. The Company primarily applies the market approach for recurring fair value measurements and utilizes the best available information that maximizes the use of observable inputs and minimizes the use of unobservable inputs. The Company is able to classify fair value balances based on the observability of those inputs. The accounting guidance establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy defined by the relevant guidance are as follows:

Level 1 — Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 1 primarily consists of financial instruments such as exchange-traded derivatives, listed equities and publicly traded bonds.

Level 2 — Pricing inputs are other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reported date. Level 2 includes financial instruments that are valued using quoted prices in markets that are not active and those financial instruments that are valued using models or other valuation methodologies. These models are primarily industry standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors, and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace.

Level 3 — Pricing inputs include significant inputs that are generally less observable from objective sources. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value. At each balance sheet date, the Company performs an analysis of all instruments subject to authoritative accounting guidance and includes, in Level 3, all of those whose fair value is based on significant unobservable inputs. As of SeptemberJune 30, 20172018 and December 31, 2016,2017, the Company did not have any Level 3 financial assets or liabilities.

8

The Company’s assets and liabilities that are measured at fair value include cash equivalents,available-for-sale securities, derivative instruments, assets held in a rabbi trust and a deferred compensation obligation. The Company’s cash equivalents consist of short-term U.S. government backed securities. The Company’savailable-for-sale securities consist of ordinary shares of Torotrak plc (“Torotrak”) associated with a license and exclusivity agreement with Torotrak. Torotrak’s listed shares are traded on the London Stock Exchange under the ticker symbol “TRK.” The Company’s derivative instruments consist of interest rate swaps. The Company’s assets held in the rabbi trust consist principally of publicly available mutual funds and target date retirement funds. The Company’s deferred compensation obligation is directly related to the fair value of assets held in the rabbi trust.

The Company’s valuation techniques used to calculate the fair value of cash and cash equivalents,available-for-sale securities, assets held in the rabbi trust and the deferred compensation obligation represent a market approach in active markets for identical assets that qualify as Level 1 in the fair value hierarchy. The Company’s valuation techniques used to calculate the fair value of derivative instruments represent a market approach with observable inputs that qualify as Level 2 in the fair value hierarchy.

The Company uses valuations from the issuing financial institutioninstitutions for the fair value measurement of interest rate derivatives. The Company corroborates the valuation through the use of third-party valuation services using a standard replacement valuation model.swaps. Thefloating-to-fixed interest rate swaps are based on the London Interbank Offered Rate (“LIBOR”) which is observable at commonly quoted intervals. The fair values are included in other current andnon-current assets and liabilities in the Condensed Consolidated Balance Sheets. The Company has not qualified for hedge accounting treatment for the interest rate swaps and, as a result, fair value adjustments are charged directly to Interest expense, net in the Condensed Consolidated Statements of Comprehensive Income.

The following table summarizes the fair value of the Company’s financial assets and (liabilities) as of SeptemberJune 30, 20172018 and December 31, 20162017 (dollars in millions):

9

Long-term debt and maturities are as follows (dollars in millions):

As of SeptemberJune 30, 2017,2018, the Company had $2,579$2,548 million of indebtedness associated with Allison Transmission, Inc.’s (“ATI”), the Company’s wholly-owned subsidiary, 5.0% Senior Notes due September 2024 (“5.0% Senior Notes”), ATI’s 4.75% Senior Notes due October 2027 (“4.75% Senior Notes”) and ATI’s Senior Secured Credit Facility (“Senior Secured Credit Facility”), which consists of the Senior Secured Credit Facility TermB-3 Loan due 2022 (“TermB-3 Loan”) and the Senior Secured Credit Facility revolving credit facility due 2021 (“Revolving Credit Facility”).

The fair value of the Company’s long-term debt obligations as of SeptemberJune 30, 20172018 was $2,623$2,507 million. The fair value is based on quoted Level 2 market prices of the Company’s debt as of SeptemberJune 30, 2017.2018. It is not expected that the Company would be able to repurchase a significant amountall of its debt at these levels. The difference between the fair value and carrying value of the long-term debt is driven primarily by trends in the financial markets.

Senior Secured Credit Facility

In March 2017, ATI entered into an amendment with the term loan lenders under its Senior Secured Credit Facility to lower the applicable margins on the TermB-3 Loan by 0.5%. The amendment also eliminated the minimum LIBOR floor and reduced the minimum floor applicable to the base rate from 1.75% to 1.00% on the TermB-3 Loan. The March 2017 amendment was treated as a modification to the Senior Secured Credit Facility under GAAP, and thus the Company recorded $1 million as new deferred financing fees.

In September 2017, ATI entered into a joinder agreement with the lenders under its Senior Secured Credit Facility to increase the available commitments under the Revolving Credit Facility from $450 million to $550 million. The joinder agreement was treated as a modification to the Revolving Credit Facility under GAAP.

In March 2018, ATI entered into an amendment with the term loan lenders under its Senior Secured Credit Facility to lower the applicable margins on the TermB-3 Loan by 0.25%. The March 2018 amendment was treated as a modification to the Senior Secured Credit Facility under GAAP, and thus the Company recorded $1 million as new deferred financing fees.

The Senior Secured Credit Facility is collateralized by a lien on substantially all assets of the Company including all of ATI’s capital stock and all of the capital stock or other equity interest held by the Company, ATI and each of the Company’s existing and future U.S. subsidiary guarantors (subject to certain limitations for equity interests of foreign subsidiaries and other exceptions set forth in the terms of the Senior Secured Credit Facility). Interest on the TermB-3 Loan, as of SeptemberJune 30, 2017,2018, is either (a) 2.00%1.75% over the LIBOR or (b) 1.00%0.75% over the greater of the prime lending rate as quoted by the administrative agent and the federal funds effective rate published by the Federal Reserve Bank of New York plus 0.5%, provided that neither is below 1.00%. As of SeptemberJune 30, 2017,2018, the Company elected to pay the lowestall-in rate of LIBOR plus the applicable margin, or 3.24%3.85%, on the TermB-3 Loan. The Senior Secured Credit Facility requires minimum quarterly principal payments on the TermB-3 Loan as well as prepayments from certain net cash proceeds ofnon-ordinary course asset sales and casualty and condemnation events and from a percentage of excess cash flow, if applicable. The minimum required quarterly principal payment on the TermB-3 Loan through its maturity date of September 2022 is $3 million.million; however, the Company made voluntary prepayments of the required quarterly principal payments of $25 million during the quarter ended June 30, 2018. As of SeptemberJune 30, 2017,2018, there had beenwere no payments required for certain net cash proceeds ofnon-ordinary course asset sales and casualty and condemnation events. The remaining principal balance is due upon maturity.

The Senior Secured Credit Facility also provides a Revolving Credit Facility, net of an allowance for up to $75 million in outstanding letters of credit commitments. Throughout the nine months ended September 30, 2017, the Company made periodic withdrawals and payments on the Revolving Credit Facility as part of its debt management plans. The maximum amount outstanding at any time during the nine months ended September 30, 2017 on the Revolving Credit Facility was $300 million. As of SeptemberJune 30, 2017,2018, the Company had $533 million available under the Revolving Credit Facility, net of $17 million in letters of credit. Revolving creditCredit Facility borrowings bear interest at a variable base rate plus an applicable margin based on the Company’s total leverage ratio. Interest on the Revolving Credit Facility is either (a) 1.75% over the LIBOR or (b) 0.75% over the greater of the prime lending rate in effect on such day and the federal funds effective rate published by the Federal Reserve Bank of New York plus 0.5%, provided that neither

10

is below 1.75%. In addition, there is an annual commitment fee, based on the Company’s total leverage ratio, on the average unused revolving credit borrowings available under the Revolving Credit Facility. Revolving creditCredit Facility borrowings are payable at the option of the Company throughout the term of the Senior Secured Credit Facility with the balance due in September 2021.

The Senior Secured Credit Facility requires the Company to maintain a specified maximum total senior secured leverage ratio of 5.50x when revolving loan commitments remain outstanding on the Revolving Credit Facility at the end of a fiscal quarter. As of SeptemberJune 30, 2017,2018, the Company had no revolving loans outstanding;amounts outstanding under the Revolving Credit Facility; however, the Company would have been in compliance with the maximum total senior secured leverage ratio, achieving a 1.19x1.03x ratio. Additionally, within the terms of the Senior Secured Credit Facility, a senior secured leverage ratio at or below 4.00x results in the elimination of excess cash flow payments on the Senior Secured Credit Facility for the applicable year. The Senior Secured Credit Facility also provides certain financial incentives based on our total leverage ratio. A total leverage ratio at or below 4.00x results in a 25 basis point reduction to the applicable margin on the Revolving Credit Facility, and a total leverage ratio at or below 3.50x results in a 12.5 basis point reduction to the Revolving Credit Facility commitment fee and an additional 25 basis point reduction to the applicable margin on the Revolving Credit Facility. These reductions would remain in effect as long as the Company achieves a total leverage ratio at or below the related threshold. As of SeptemberJune 30, 2017,2018, the Company’s total leverage ratio was 2.90x.2.40x.

In addition, the Senior Secured Credit Facility, among other things, includes customary restrictions (subject to certain exceptions) on the Company’s ability to incur certain indebtedness, grant certain liens, make certain investments, declare or pay certain dividends, or repurchase shares of the Company’s common stock. As of SeptemberJune 30, 2017,2018, the Company iswas in compliance with all covenants under the Senior Secured Credit Facility.

5.0% Senior Notes

The 5.0% Senior Notes are unsecured and are guaranteed by each of ATI’s domestic subsidiaries that is a borrower under or guarantees the Senior Secured Credit Facility and are unconditionally guaranteed, jointly and severally, by any of ATI’s future domestic subsidiaries that are borrowers under or guarantee the Senior Secured Credit Facility. None of ATI’s domestic subsidiaries currently guarantee its obligations under the Senior Secured Credit Facility, and therefore none of ATI’s domestic subsidiaries currently guarantee the 5.0% Senior Notes. The indenture governing the 5.0% Senior Notes contains negative covenants restricting or limiting the Company’s ability to, among other things: incur or guarantee additional indebtedness, incur liens, pay dividends on, redeem or repurchase the Company’s capital stock, make certain investments, permit payment or dividend restrictions on certain of the Company’s subsidiaries, sell assets, engage in certain transactions with affiliates, and consolidate or merge or sell all or substantially all of the Company’s assets. As of SeptemberJune 30, 2017,2018, the Company iswas in compliance with all covenants under the indenture governing the 5.0% Senior Notes.

4.75% Senior Notes

In September 2017, ATI completed an offering of $400 million of 4.75% Senior Notes. The 4.75% Senior Notes were offered in a private placement exempt from registration under the Securities Act of 1933, as amended. The proceeds from the offering were used for general corporate purposes and to pay related transaction fees and expenses. As a result of the offering, the Company recorded approximately $5 million as deferred financing fees in the Condensed Consolidated Balance Sheets.

The 4.75% Senior Notes are unsecured and are guaranteed by each of ATI’s domestic subsidiaries that is a borrower under or guarantees the Senior Secured Credit Facility and are unconditionally guaranteed, jointly and severally, by any of ATI’s future domestic subsidiaries that are borrowers under or guarantee the Senior Secured Credit Facility. None of ATI’s domestic subsidiaries currently guarantee its obligations under the Senior Secured Credit Facility, and therefore none of ATI’s domestic subsidiaries currently guarantee the 4.75% Senior Notes. The indenture governing the 4.75% Senior Notes contains negative covenants restricting or limiting the Company’s ability to, among other things: incur or guarantee additional indebtedness, incur liens, pay dividends on, redeem or repurchase the Company’s capital stock, make certain investments, permit payment or dividend restrictions on certain of the Company’s subsidiaries, sell assets, engage in certain transactions with affiliates, and consolidate or merge or sell all or substantially all of the Company’s assets. As of SeptemberJune 30, 2017,2018, the Company iswas in compliance with all covenants under the indenture governing the 4.75% Senior Notes.

11

The Company is exposed to certain financial risk from volatility in interest rates, foreign exchange rates and commodity prices. The risk is managed through the use of financial derivative instruments including interest rate swaps, foreign currency swaps and commodity swaps, when appropriate. The Company’s current derivative instruments are used strictly as an economic hedge and not for speculative purposes. As necessary, the Company adjusts the values of the derivative instruments for counter-party or credit risk.

Interest Rate

The Company is subject to interest rate risk related to the Senior Secured Credit Facility and enters into interest rate swap contractsswaps that are based on the LIBOR to manage a portion of this exposure. The derivative instruments are not for speculative purposes and are designated as cash flow hedges.

The Company has not electedholds interest rate swaps designated as cash flow hedges that qualify for hedge accounting treatment for these derivatives, and as a result, fairunder the hypothetical derivative method. Fair value adjustments are charged directly to Interest expense, netrecorded as a component of accumulated other comprehensive loss (“AOCL”) in the Condensed Consolidated StatementsBalance Sheets. Balances in AOCL are reclassified to other comprehensive income when transactions related to the underlying risk are settled. As of Comprehensive Income.

A summaryJune 30, 2018, the Company held interest rate swaps effective from September 2019 to September 2022 with notional values totaling $250 million and a weighted average LIBOR fixed rate of 3.01% and interest rate swaps effective from September 2019 to September 2025 with notional values totaling $250 million and a weighted average LIBOR fixed rate of 3.04%. See NOTE F “Fair Value of Financial Instruments” for information regarding the fair value of the Company’s interest rate derivatives as of September 30, 2017 and December 31, 2016 follows (dollars in millions):swaps.

The following tabular disclosures further describe the Company’s interest rate derivative instrumentsderivatives qualifying and designated for hedge accounting and their impact on the financial condition of the Company (dollars in millions):

The following tabular disclosure describesbalance of losses recorded in AOCL as of June 30, 2018 was $2 million. See NOTE N “Accumulated Other Comprehensive Loss” for information regarding activity recorded as a component of AOCL during the locationthree and impact onsix months ended June 30, 2018. The Company had no losses recorded in accumulated other comprehensive loss expected to be reclassified to other comprehensive income within the Company’s resultsnext twelve months as of operations related to unrealized gain (loss) on interest rate derivatives (dollars in millions):June 30, 2018.

12

As of June 30, 2018, the current andnon-current product warranty liabilities were $28 million and $37 million, respectively. As of June 30, 2017, the current andnon-current product warranty liabilities were $21 million and $34 million, respectively.

Product warranty liability activities consist of the following (dollars in millions):

As of September 30, 2017, the current andnon-current product warranty liabilities were $22 million and $27 million, respectively. As of September 30, 2016, the current andnon-current product warranty liabilities were $28 million and $42 million, respectively.

As of SeptemberJune 30, 2018, current andnon-current deferred revenue was $38 million and $87 million, respectively. As of June 30, 2017, the current andnon-current deferred revenue were $33was $28 million and $75 million, respectively. As of September 30, 2016, the current andnon-current deferred revenue were $24 million and $61$68 million, respectively.

Deferred revenue activity consists of the following (dollars in millions):

Deferred revenue recorded in current andnon-current liabilities related to extended transmission coverage (“ETC”)ETC contracts as of SeptemberJune 30, 2017 were2018 was $29 million and $70$71 million, respectively. Deferred revenue recorded in current andnon-current liabilities related to ETC contracts as of SeptemberJune 30, 2016 were $242017 was $27 million and $61$68 million, respectively.

13

Other current liabilities consist of the following (dollars in millions):

Components of net periodic benefit cost (credit) consist of the following (dollars in millions):

The components of net periodic benefit costs other than the service cost component are included in other income (expense), net in the Condensed Consolidated Statements of Comprehensive Income.