AmeriCredit Prime Automobile Receivables Trust 2007-2-M FWP Free writing prospectus

Filing pursuant to Rule 433,

Filing No. 333-140931-02

The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer or any underwriter or any dealer participating in the offering will arrange to send you the prospectus if you request it by calling 1-866-669-7629 or by emailing Randall Outlaw at randall.outlaw@jpmorgan.com.

Any disclaimer or other notice that may appear below is not applicable to this communication and should be disregarded. Such disclaimer or notice was automatically generated as a result of this communication being sent by Bloomberg or another email system.

! ACAR07CM.CDI ASSET_BACKED_AUTOLOAN PORTFOLIO

! FileCtrlno: 1186675163 Seqno: 2 Created: 20071008 Last Modified: 20071008 SIGNATURE:

1826700410

PORTFOLIO_STRING “Surety fee assumed, spread account details assumed.”

DEAL_COMMENT “Credit Enhancement consists of :Subordination, Overcollateralization,

a Reserve Account, Interest Rate Swaps and a Financial Guaranty.”

ifdef #cmover_3.1d _

DEFINE SETTINGS CASHFLOW_REINVESTMENT_ALLOWED NO

! Modeled in the Intex CMO Modeling Language, (BL)

! Intex shall not be held liable for the accuracy of this data

! nor for the accuracy of information which is derived from this data.

PRICING _

DEFINE STANDARDIZE ORIG_COLL_BAL GROUP 0 CONSTANT #OrigCollBal =

769230769.23

CLOSING _

DEFINE STANDARDIZE ORIG_COLL_BAL GROUP 0 CONSTANT #OrigCollBal =

769230769.23

FULL_DEALNAME: AmeriCredit Prime Automobile Receivables Trust 2007-2-M

TRUSTEE_INDENTURE: Bank of New York

TRUSTEE_OWNER: Wilmington Trust Company

SERVICER_MASTER: Americredit Financial Services

ISSUER: AmeriCredit Auto Receivables

TRUSTEE_DEAL: Bank of New York

DEALER: JPMorgan / RBS Greenwich Capital / Wachovia Securities / BMO Capital Markets / UBS Investment Bank

DEAL SIZE: $750000000.00

PRICING SPEED: 1.7% ABS

ISSUE DATE: 20071011

SETTLEMENT DATE: 20071018

DEAL_CLOCK_INFO _

ISSUE_CDU_DATE 20071001 _

DEAL_FIRSTPAY_DATE 20071108

Record date delay: 0

!!!!!!* Attempt to load without IDX file

!!!!!! DEFINE IDXFILE “ABS”

!!!!!!!!!!!!*ifdef #cmover_3.1f

!!!!!!!!!!!!*DEFINE MACRO #Proxy_RSV_REINV = PROXY LIBOR_1MO

!!!!!!!!!!!!*ifndef #cmover_3.1f

!!!!!!!!!!!!*DEFINE MACRO #Proxy_RSV_REINV =

!!!!*DEFINE INDEX _RSV_REINVESTMENT {#Proxy_RSV_REINV}

!!!!*DEFINE INDEX _RSV_REINVESTMENT 0

!!!*INITIAL INDEX _RSV_REINVESTMENT 0.00000

DEFINE #SpecRsvBal = 0.00

DEFINE #SpecRsvDep = 0.00

DEFINE #CumDefault = 0.00

DEFINE #AccTermDate = 0.00

DEFINE #OC = 19230769.23

DEFINE #OClevel = 0.00

DEFINE #RatioValue = 0.00

DEFINE #OC_PCT = 0.0675

EXPENSE “TrusteeFee” = 0

DEFINE TR_INDEXDEPS_ALL

!!!Initial Index is assumed.

!* INITIAL INDEX LIBOR_1MO 5.12

Tranche “A1” SEN_FIX

Block $ 137000000.00 at 5.2747 CLOSING 5.2747 Delay 0 Dated 20071018 Next 20071108

DAYCOUNT ACTUAL360

Tranche “A2A” SEN_FIX

Block $ 98000000.00 at 5.19 CLOSING 5.19

PRICING

Tranche “A2B” SEN_FIX

Block $ 98000000.00 at 5.19 CLOSING 5.19

CLOSING

Tranche “A2B” SEN_FIX

Block $ 98000000.00 at 5.19 CLOSING 5.19

Tranche “A3A” SEN_FIX

Block $ 101000000.00 at 5.04 CLOSING 5.04

PRICING

Tranche “A3B” SEN_FIX

Block $ 101000000.00 at 5.04 CLOSING 5.04

CLOSING

Tranche “A3B” SEN_FIX

Block $ 101000000.00 at 5.04 CLOSING 5.04

Tranche “A4A” SEN_FIX

Block $ 107500000.00 at 5.17 CLOSING 5.17

PRICING

Tranche “A4B” SEN_FIX

Block $ 107500000.00 at 5.17 CLOSING 5.17

CLOSING

Tranche “A4B” SEN_FIX

Block $ 107500000.00 at 5.17 CLOSING 5.17

!!!****SWAP ACCRUAL OF 30360 IS ASSUMED***!!!

Tranche “SWAP_IN1” PSEUDO HEDGE

Block 101000000.00 FLOAT NOTIONAL WITH FORMULA ( BBAL(“A3B”) ); _

DAYCOUNT 30360 BUSINESS_DAY FOLLOWING FREQ M _

Delay 0 Dated 20071018 Next 20071108

1 * LIBOR_1MO + 0

0 999

!!!A3B FIXED SWAP OUT RATE PAGE S-16 OF DOC

Tranche “SWAP_OUT1” PSEUDO HEDGE

Block 98000000.00 at 5.303 NOTIONAL WITH FORMULA ( BBAL(“A3B”) ); _

DAYCOUNT 30360 BUSINESS_DAY NONE FREQ M _

Delay 0 Dated 20071018 Next 20071108

Tranche “SWAP_IN2” PSEUDO HEDGE

Block 101000000.00 FLOAT NOTIONAL WITH FORMULA ( BBAL(“A4B”) ); _

DAYCOUNT 30360 BUSINESS_DAY FOLLOWING FREQ M _

Delay 0 Dated 20071018 Next 20071108

1 * LIBOR_1MO + 0

0 999

!!!A4B FIXED SWAP OUT RATE PAGE S-16 OF DOC

Tranche “SWAP_OUT2” PSEUDO HEDGE

Block 107500000.00 at 5.409 NOTIONAL WITH FORMULA ( BBAL(“A4B”) ); _

DAYCOUNT 30360 BUSINESS_DAY NONE FREQ M _

Delay 0 Dated 20071018 Next 20071108

!!!***Fee assumed from PRIOR DEAL***!!!

Tranche “GUARFEE” SEN_FEE_NO !NO_CUSIP_OK

Block $ 750000000.00 at 0.16 NOTIONAL WITH TRANCHE “A1”, “A2A”, “A2B”, “A3A”,

“A3B”, “A4A”, “A4B” Delay 0 Dated 20071017 Next 20071108

Tranche “SELLER” NPR_NPR

Block $ 19230769.23 CLOSING 19230769.23 at 0.0 SURPLUS

Tranche “#OC” SYMVAR

RESERVE_FUND “RSV_ACCT” ON TRANCHE

“A1”&”A2A”&”A2B”&”A3A”&”A3B”&”A4A”&”A4B” _

COVERS INTEREST SHORTFALLS _

COVERS DELINQ LOSSES _

COVERS TRANCHE MATURITY_BAL _

STARTING_BALANCE ( 7692307.69 ); _

FUNDING_FROM RULES _

REINVEST_AT ( 0 );

FINANCIAL_GUARANTY “FG” ON TRANCHE

“A1”&”A2A”&”A2B”&”A3A”&”A3B”&”A4A”&”A4B _

COVERS INTEREST SHORTFALLS _

COVERS TRANCHE MATURITY_BAL _

COVERS DELINQ LOSSES _

FUNDING_FROM RULES _

BY MBIA

!!!! define MACRO #HB_SWAP1 = BALANCE NOTIONAL WITH TRANCHE “SWAP_OUT1”

!!!! define MACRO #HB_SWAP2 = BALANCE NOTIONAL WITH TRANCHE “SWAP_OUT2”

!!!!! HEDGE “SWAP1” _

!!!!! TYPE SWAP {#HB_SWAP1} _

!!!!! COVERS INT_COLLECTION _

!!!!! LEG “OUT_LEG” DEAL_PAYS OPTIMAL_INTPMT “SWAP_OUT1” _

!!!!! LEG “IN_LEG” DEAL_RECEIVES OPTIMAL_INTPMT “SWAP_IN1” _

!!!!! BY “Credit Suisse International” _

!!!!! DESCR “A3B Inerest Rate Swap”

!!!!! HEDGE “SWAP2” _

!!!!! TYPE SWAP {#HB_SWAP2} _

!!!!! COVERS INT_COLLECTION _

!!!!! LEG “OUT_LEG” DEAL_PAYS OPTIMAL_INTPMT “SWAP_OUT2” _

!!!!! LEG “IN_LEG” DEAL_RECEIVES OPTIMAL_INTPMT “SWAP_IN2” _

!!!!! BY “Credit Suisse International” _

!!!!! DESCR “A4B Inerest Rate Swap”

CLASS “SELLER” NO_BUILD_TRANCHE _

= “SELLER#1”

CLASS “A1” NO_BUILD_TRANCHE _

= “A1”

CLASS “A2A” NO_BUILD_TRANCHE _

= “A2A”

CLASS “A2B” NO_BUILD_TRANCHE _

= “A2B”

CLASS “A3A” NO_BUILD_TRANCHE _

= “A3A”

CLASS “A3B” NO_BUILD_TRANCHE _

= “A3B”

CLASS “A4A” NO_BUILD_TRANCHE _

= “A4A”

CLASS “A4B” NO_BUILD_TRANCHE _

= “A4B”

CLASS “GUARFEE” NO_BUILD_TRANCHE _

= “GUARFEE”

CLASS “A2” DISTRIB_CLASS PRORATA WRITEDOWN_BAL PRORATA ALLOCATION _

= “A2A” “A2B”

CLASS “A3” DISTRIB_CLASS PRORATA WRITEDOWN_BAL PRORATA ALLOCATION _

= “A3A” “A3B”

CLASS “A4” DISTRIB_CLASS PRORATA WRITEDOWN_BAL PRORATA ALLOCATION _

= “A4A” “A4B”

CLASS “NOTES” WRITEDOWN_BAL PRORATA ALLOCATION _

= “A1” “A2” “A3” “A4” “GUARFEE”

CLASS “ROOT” SHORTFALL_PAYBACK ALLOCATION TRUE _

SHORTFALL_EARN_INT INTEREST TRUE _

WRITEDOWN_BAL RULES _

DISTRIB_CLASS RULES _

NO_BUILD_TRANCHE = “NOTES” “SELLER”

DEFINE PSEUDO_TRANCHE CLASS “NOTES” Delay 05 Dated 20071001 Next 20071108

DAYCOUNT 30360 BUSINESS_DAY NONE

DEFINE PSEUDO_TRANCHE CLASS “A2” Delay 05 Dated 20071001 Next 20071108

DAYCOUNT 30360 BUSINESS_DAY NONE

DEFINE PSEUDO_TRANCHE CLASS “A3” Delay 05 Dated 20071001 Next 20071108

DAYCOUNT 30360 BUSINESS_DAY NONE

DEFINE PSEUDO_TRANCHE CLASS “A4” Delay 05 Dated 20071001 Next 20071108

DAYCOUNT 30360 BUSINESS_DAY NONE

INTEREST_SHORTFALL FULL_PREPAY Compensate Pro_rata _

PARTIAL_PREPAY Compensate Pro_rata _

LOSS NO_Compensate Subordinated Accum

OPTIONAL REDEMPTION: “CLEANUP” ( COLL_BAL / #OrigCollBal LE 10% )

CROSSOVER When 0

Tranche Cusip Stated Maturity

A1 030616AA4 20081008 RATING SP “A-1+” MD “P-1” FT “F1+”

A2A 030616AB2 20101108 RATING SP “AAA” MD “Aaa” FT “AAA”

A2B 030616AC0 20101108 RATING SP “AAA” MD “Aaa” FT “AAA”

A3A 030616AD8 20120608 RATING SP “AAA” MD “Aaa” FT “AAA”

A3B 030616AE6 20120608 RATING SP “AAA” MD “Aaa” FT “AAA”

A4A 030616AF3 20160308 RATING SP “AAA” MD “Aaa” FT “AAA”

A4B 030616AG1 20160308 RATING SP “AAA” MD “Aaa” FT “AAA”

SELLER XXXX07TBD 20160308

SWAP_IN1 XXXX08TBD

SWAP_OUT1 XXXX09TBD

SWAP_IN2 XXXX10TBD

SWAP_OUT2 XXXX11TBD

CMO Block Payment Rules

----------------------------------

!!!!! from : HEDGE (“SWAP1”)

!!!!! pay : CASH_ACCOUNT (0)

----------------------------------

!!!!! from : CASH_ACCOUNT (100)

!!!!! pay : HEDGE (“SWAP1”)

----------------------------------

!!!!! from : HEDGE (“SWAP2”)

!!!!! pay : CASH_ACCOUNT (0)

----------------------------------

!!!!! from : CASH_ACCOUNT (100)

!!!!! pay : HEDGE (“SWAP2”)

----------------------------------

!!!Step down assumes trust performance triggers are met and no insurance agreement event of default

has occurred per S-47 in doc.!!!

calculate : #ProFormPct = MIN( 93.25% , (1-(7692307.69/COLL_BAL)))

calculate : #Princ = ( COLL_PREV_BAL - COLL_BAL )

calculate : #Interest = COLL_I + COLL(“NS_INTSHORT”)

calculate : #ReqProForm = MAX( 0 , #ProFormPct * COLL_BAL )

calculate : #ProForm = BBAL(“NOTES”) - #Princ

calculate : #StepDnAmt = MAX( 0.0 , #ReqProForm - #ProForm )

calculate : #ReqProDef = MAX( 0.0 , #ProForm - #ReqProForm )

calculate : #Princ = MAX( 0.0 , #Princ - #StepDnAmt )

calculate : #Excess = MAX( 0.0, #Interest - OPTIMAL_INTPMT( “ROOT” ) )

!!! Reserve target is assumed to be the same as the initial spread target of 1% of original collat.

calculate : #SpecRsvBal = MIN( BBAL( “NOTES” ), 1.0% * #OrigCollBal )

!!!!RETAINED FOR FUTURE DEAL WITH PREFUND COLLAT!!!

!!! USE THIS IF THERE IS PREFUND COLLAT THAT INCREASES THE SPREAD AS THE

COLLAT VALIDATES.

!!! RESERVE IS FUNDED WHEN PREFUNDED COLLAT VALIDATES

!!! calculate : #SpecRsvBal = IF CURDATE EQ 20061006 THEN 16500000 ELSE _

!!! IF CURDATE EQ 20061106 THEN 16500000 ELSE _

!!! IF CURDATE EQ 20061206 THEN 19648648.65 ELSE _

!!! IF CURDATE EQ 20070106 THEN 22797297.30 ELSE _

!!! MIN( BBAL( “NOTES” ), 2.0% * #OrigCollBal )

calculate : #SpecRsvDep = MAX( 0, #SpecRsvBal—CREDIT_ENHANCEMENT ( “RSV_ACCT” ) )

calculate : #SpecRsvRel = MAX( 0, CREDIT_ENHANCEMENT ( “RSV_ACCT” ) - #SpecRsvBal )

calculate : #AccPrn = MAX( 0, MIN( #Excess + #SpecRsvRel , #ReqProDef ))

calculate : #NotePrn = #Princ + #AccPrn

!!!RETAINED CODE FOR FUTURE DEAL IF IT HAS PREFUND COLLAT

!!!-----------------------------------

!!! when : IS_TRUE ( CURDATE EQ 20061106 )

!!! from : NOWHERE ( 3148648.65 )

!!! pay : CREDIT_ENHANCEMENT ( “RSV_ACCT” )

!!!-----------------------------------

!!!!

!!!-----------------------------------

!!! when : IS_TRUE ( CURDATE EQ 20061206 )

!!! from : NOWHERE ( 3148648.65 )

!!! pay : CREDIT_ENHANCEMENT ( “RSV_ACCT” )

!!!-----------------------------------

!!!!

!!!-----------------------------------

!!! when : IS_TRUE ( CURDATE EQ 20070106 )

!!! from : NOWHERE ( 3148648.65 )

!!! pay : CREDIT_ENHANCEMENT ( “RSV_ACCT” )

!!!-----------------------------------

-----------------------------------

from : CREDIT_ENHANCEMENT ( “RSV_ACCT” )

subject to : CEILING ( #SpecRsvRel )

pay : CASH_ACCOUNT ( 0 )

-----------------------------------

calculate : “NOTES” _

CUSTOM AMOUNT = 0

-----------------------------------

from : CLASS ( “ROOT” )

pay : EXPENSE ( “TrusteeFee” )

-----------------------------------

pay : CLASS INTEREST SEQUENTIAL ( “NOTES” )

pay : CLASS INTSHORT SEQUENTIAL ( “NOTES” )

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS INTEREST PRO_RATA ( “A1”;”A2”;”A3”;”A4” )

pay : CLASS INTSHORT PRO_RATA ( “A1”;”A2”;”A3”;”A4” )

-----------------------------------

from : CLASS ( “A2” )

pay : CLASS INTEREST PRO_RATA ( “A2A”; “A2B” )

pay : CLASS INTSHORT PRO_RATA ( “A2A”; “A2B” )

-----------------------------------

from : CLASS ( “A3” )

pay : CLASS INTEREST PRO_RATA ( “A3A”; “A3B” )

pay : CLASS INTSHORT PRO_RATA ( “A3A”; “A3B” )

-----------------------------------

from : CLASS ( “A4” )

pay : CLASS INTEREST PRO_RATA ( “A4A”; “A4B” )

pay : CLASS INTSHORT PRO_RATA ( “A4A”; “A4B” )

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS INTEREST SEQUENTIAL ( “GUARFEE” )

pay : CLASS INTSHORT SEQUENTIAL ( “GUARFEE” )

-----------------------------------

from : SUBACCOUNT ( #Princ, CLASS “ROOT” )

pay : CLASS BALANCE SEQUENTIAL ( “NOTES” )

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS BALANCE SEQUENTIAL (“A1”)

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS BALANCE SEQUENTIAL (“A2”)

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS BALANCE SEQUENTIAL (“A3”)

-----------------------------------

from : CLASS ( “A3” )

pay : CLASS BALANCE PRO_RATA ( “A3A” ; “A3B” )

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS BALANCE SEQUENTIAL (“A4”)

-----------------------------------

from : CLASS ( “A4” )

pay : CLASS BALANCE PRO_RATA ( “A4A” ; “A4B” )

-----------------------------------

from : CLASS ( “A1” )

pay : SEQUENTIAL ( “A1#1” )

-----------------------------------

from : CLASS ( “A2A” )

pay : SEQUENTIAL ( “A2A#1” )

-----------------------------------

from : CLASS ( “A2B” )

pay : SEQUENTIAL ( “A2B#1” )

-----------------------------------

from : CLASS ( “A3A” )

pay : SEQUENTIAL ( “A3A#1” )

-----------------------------------

from : CLASS ( “A3B” )

pay : SEQUENTIAL ( “A3B#1” )

-----------------------------------

from : CLASS ( “A4A” )

pay : SEQUENTIAL ( “A4A#1” )

-----------------------------------

from : CLASS ( “A4B” )

pay : SEQUENTIAL ( “A4B#1” )

-----------------------------------

from : CLASS ( “ROOT” )

pay : REIMBURSE CREDIT_ENHANCEMENT ( “FG” )

-----------------------------------

from : SUBACCOUNT ( #SpecRsvDep , CLASS “ROOT” )

pay : CREDIT_ENHANCEMENT ( “RSV_ACCT” )

-----------------------------------

from : SUBACCOUNT ( #AccPrn, CLASS “ROOT” )

pay : CLASS BALANCE SEQUENTIAL ( “NOTES” )

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS BALANCE SEQUENTIAL (“A1”)

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS BALANCE SEQUENTIAL (“A2”)

-----------------------------------

from : CLASS ( “A2” )

pay : CLASS BALANCE PRO_RATA ( “A2A” ; “A2B” )

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS BALANCE SEQUENTIAL (“A3”)

-----------------------------------

from : CLASS ( “A3” )

pay : CLASS BALANCE PRO_RATA ( “A3A” ; “A3B” )

-----------------------------------

from : CLASS ( “NOTES” )

pay : CLASS BALANCE SEQUENTIAL (“A4”)

-----------------------------------

from : CLASS ( “A4” )

pay : CLASS BALANCE PRO_RATA ( “A4A” ; “A4B” )

-----------------------------------

from : CLASS ( “A1” )

pay : SEQUENTIAL ( “A1#1” )

-----------------------------------

from : CLASS ( “A2A” )

pay : SEQUENTIAL ( “A2A#1” )

-----------------------------------

from : CLASS ( “A2B” )

pay : SEQUENTIAL ( “A2B#1” )

-----------------------------------

from : CLASS ( “A3A” )

pay : SEQUENTIAL ( “A3A#1” )

-----------------------------------

from : CLASS ( “A3B” )

pay : SEQUENTIAL ( “A3B#1” )

-----------------------------------

from : CLASS ( “A4A” )

pay : SEQUENTIAL ( “A4A#1” )

-----------------------------------

from : CLASS ( “A4B” )

pay : SEQUENTIAL ( “A4B#1” )

-----------------------------------

calculate : #Loss = MAX( 0, BBAL( “A1#1”, “A2A#1”, “A2B#1”, “A3A#1”, “A3B#1”, “A4A#1”, “A4B#1” ) - COLL_BAL )

-----------------------------------

from : CREDIT_ENHANCEMENT ( “RSV_ACCT” )

pay : CLASS INTEREST SEQUENTIAL ( “NOTES” )

-----------------------------------

from : CREDIT_ENHANCEMENT ( “RSV_ACCT” )

subject to : CEILING ( #Loss )

pay : CLASS BALANCE SEQUENTIAL ( “NOTES” )

-----------------------------------