1
 
                             LETTER OF TRANSMITTAL
                        TO TENDER SHARES OF COMMON STOCK
            (INCLUDING THE ASSOCIATED COMMON STOCK PURCHASE RIGHTS)
                                       OF
 
                                 TREADCO, INC.
             PURSUANT TO THE OFFER TO PURCHASE DATED MARCH 23, 1999
                                       BY
 
                           ARKANSAS BEST CORPORATION
- --------------------------------------------------------------------------------
         THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT,
        NEW YORK CITY TIME, ON TUESDAY, APRIL 20, 1999, UNLESS EXTENDED.
- --------------------------------------------------------------------------------
 
                        The Depositary for the Offer is:
 
                        HARRIS TRUST COMPANY OF NEW YORK
 

                                             
                   By Mail:                              By Hand/Overnight Delivery:
             Wall Street Station                                Receive Window
                P.O. Box 1023                                 Wall Street Plaza
        New York, New York 10268-1023                     88 Pine Street, 19th Floor
                                                           New York, New York 10005

 
                                 By Facsimile:
                                 (212) 701-7636
 
                             Confirm by Telephone:
                                 (212) 701-7624
 
         DELIVERY OF THIS INSTRUMENT TO AN ADDRESS, OR TRANSMISSION OF
      INSTRUCTIONS VIA A FACSIMILE NUMBER, OTHER THAN AS SET FORTH ABOVE,
                     DOES NOT CONSTITUTE A VALID DELIVERY.
 
       THE INSTRUCTIONS SET FORTH IN THIS LETTER OF TRANSMITTAL SHOULD BE
         READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED.
 
     This Letter of Transmittal is to be used either if certificates are to be
forwarded herewith or, unless an Agent's Message (as defined in "THE TENDER
OFFER -- Procedure for Tendering Shares" of the Offer to Purchase) is utilized,
if delivery of Shares (as defined below) is to be made by book-entry transfer to
the account maintained by the Depositary at the Book-Entry Transfer Facility as
defined in and pursuant to the procedures set forth in "THE TENDER
OFFER -- Procedure for Tendering Shares" of the Offer to Purchase. Stockholders
who deliver Shares by book-entry transfer are referred to herein as "Book-Entry
Stockholders" and other stockholders are referred to herein as "Certificate
Stockholders." Stockholders whose certificates for Shares are not immediately
available or who cannot deliver either the certificates for, or a Book-Entry
Confirmation (as defined in "THE TENDER OFFER -- Procedure for Tendering Shares"
of the Offer to Purchase) with respect to, their Shares and all other documents
required hereby to the Depositary (or who are unable to complete the procedure
for book-entry transfer on a timely basis) on or prior to the Expiration Date
(as defined in "THE TENDER OFFER -- Terms of the Offer" of the Offer to
Purchase) must tender their Shares in accordance with the guaranteed delivery
procedure set forth in "THE TENDER OFFER -- Procedure for Tendering Shares" of
the Offer to Purchase. See Instruction 2.
   2
 
                PLEASE SEE THE INSTRUCTIONS BEGINNING ON PAGE 8.
 
[ ]     CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
        MADE TO THE ACCOUNT MAINTAINED BY THE DEPOSITARY WITH THE BOOK-ENTRY
        TRANSFER FACILITY AND COMPLETE THE FOLLOWING (ONLY PARTICIPANTS IN THE
        BOOK-ENTRY TRANSFER FACILITY MAY DELIVER SHARES BY BOOK-ENTRY TRANSFER):
 
      Name of Tendering Institution
 
                                   ---------------------------------------------
 
      Account Number
                    ------------------------------------------------------------
 
      Transaction Code Number
                             ---------------------------------------------------
 
[ ]     CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE
        OF GUARANTEED DELIVERY PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE
        THE FOLLOWING:
 
      Name(s) of Registered Owner(s)
 
                                    --------------------------------------------
 
      Window Ticket Number (if any)
 
                                   ---------------------------------------------
 
      Date of Execution of Notice of Guaranteed Delivery
                                                        ------------------------
 
      Name of Institution which Guaranteed Delivery
                                                   -----------------------------
 
      --------------------------------------------------------------------------
 
      Account Number
                    ------------------------------------------------------------
 
      Transaction Code Number
                             ---------------------------------------------------
 
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- ----------------------------------------------------------------------------------------------------------------------
                                            DESCRIPTION OF SHARES TENDERED
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NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S)
(PLEASE FILL IN, IF BLANK, EXACTLY AS NAME(S) APPEAR(S) ON                       SHARES TENDERED
CERTIFICATE(S))                                                       (ATTACH ADDITIONAL LIST IF NECESSARY)
- ----------------------------------------------------------------------------------------------------------------------
                                                                                  TOTAL NUMBER
                                                                                    OF SHARES            NUMBER
                                                               CERTIFICATE       REPRESENTED BY         OF SHARES
                                                               NUMBER(S)*        CERTIFICATE(S)*       TENDERED**
 
                                                             ------------------------------------------------------
                                                             ------------------------------------------------------
                                                             ------------------------------------------------------
                                                             ------------------------------------------------------
                                                             ------------------------------------------------------
                                                             ------------------------------------------------------
                                                             ------------------------------------------------------
                                                             ------------------------------------------------------
                                                             ------------------------------------------------------
                                                              TOTAL SHARES
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  * Need not be completed by Book-Entry Stockholders.
 ** If you desire to tender fewer than all Shares evidenced by any certificates listed above, please indicate in this
    column the number of Shares you wish to tender. Otherwise, all Shares evidenced by such certificates will be
    deemed to have been tendered.
- ----------------------------------------------------------------------------------------------------------------------

 
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                    NOTE: SIGNATURES MUST BE PROVIDED BELOW
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY
 
Ladies and Gentlemen:
 
     The undersigned hereby tenders to Arkansas Best Corporation, a Delaware
corporation ("Parent"), the above-described shares of the outstanding common
stock, par value $.01 per share (the "Common Stock"), including the associated
common stock purchase rights (the "Rights" and, together with the Common Stock,
the "Shares") of Treadco, Inc. a Delaware corporation (the "Company"), pursuant
to Parent's offer to purchase all outstanding Shares at a price of $9.00 per
Share, net to the undersigned in cash, without interest thereon, in accordance
with the terms and conditions of Parent's Offer to Purchase, dated March 23,
1999 (the "Offer to Purchase"), and this Letter of Transmittal (which together
with any amendments or supplements thereto or hereto, collectively constitute
the "Offer"), receipt of which is hereby acknowledged. Capitalized terms used
herein and not otherwise defined have the meaning given them in the Offer to
Purchase.
 
     Upon the terms of the Offer, subject to, and effective upon, acceptance for
payment of, and payment for, the Shares tendered herewith in accordance with the
terms and subject to the conditions of the Offer (including, if the Offer is
extended or amended, the terms or conditions of any such extension or
amendment), the undersigned hereby sells, assigns and transfers to, or upon the
order of, Parent all right, title and interest in and to all the Shares tendered
hereby (and any and all other Shares or other securities or rights issued or
issuable in respect of such Shares on or after March 15, 1999) and irrevocably
constitutes and appoints the Depositary the true and lawful agent and
attorney-in-fact of the undersigned with respect to such Shares (and any such
other Shares or securities or rights), with full power of substitution (such
power of attorney being deemed to be an irrevocable power coupled with an
interest), to (a) deliver certificates for such Shares (and any such other
Shares or securities or rights) or transfer ownership of such Shares (and any
such other Shares or securities or rights) on the account books maintained by
the Book-Entry Transfer Facility, together, in any such case, with all
accompanying evidence of transfer and authenticity, to, or upon the order of,
Parent; (b) present such Shares (and any such other Shares or securities or
rights) for transfer on the Company's books; and (c) receive all benefits and
otherwise exercise all rights of beneficial ownership of such Shares (and any
such other Shares or securities or rights), all in accordance with the terms of
the Offer.
 
     The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, sell, assign and transfer the tendered
Shares (and any and all other Shares or other securities or rights issued or
issuable in respect of such Shares on or after March 15, 1999) and that, when
the same are accepted for payment, Parent will acquire good, marketable and
unencumbered title thereto, free and clear of all liens, restrictions, claims,
charges and encumbrances and the same will not be subject to any adverse claim.
The undersigned will, upon request, execute any additional documents deemed by
the Depositary or Parent to be necessary or desirable to complete the sale,
assignment and transfer of the tendered Shares (and any such other Shares or
securities or rights).
 
     All authority conferred or agreed to be conferred in this Letter of
Transmittal shall be binding upon the successors, assigns, heirs, executors,
administrators, trustees in bankruptcy and legal representatives of the
undersigned and shall not be affected by, and shall survive, the death or
incapacity of the undersigned. Except as stated in the Offer to Purchase, this
tender is irrevocable.
 
     The undersigned hereby irrevocably appoints David E. Loeffler and Richard
F. Cooper, in their respective capacities as officers of Parent, and any
individual who shall hereafter succeed to any such office of Parent, and each of
them, and any other designees of Parent, the attorneys-in-fact and proxies of
the undersigned, each with full power of substitution, to vote at any annual,
special or adjourned meeting of the Company's stockholders or otherwise in such
manner as each such attorney and proxy or his substitute shall in his sole
discretion deem proper with respect to, to execute any written consent
concerning any matter as each such attorney and proxy or his substitute shall in
his sole discretion deem proper with respect to, and to otherwise act as each
such attorney and proxy or his substitute shall in his sole discretion deem
proper with respect to, all the Shares tendered hereby that have been accepted
for payment by Parent prior to the time any such action is
 
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taken and with respect to which the undersigned is entitled to vote (and with
respect to any and all other Shares or other securities or rights issued or
issuable in respect of such Shares on or after March 15, 1999). This appointment
is effective when, and only to the extent that, Parent accepts for payment such
Shares as provided in the Offer to Purchase. This power of attorney and proxy
are irrevocable and are granted in consideration of the acceptance for payment
of such Shares in accordance with the terms of the Offer. Such acceptance for
payment shall, without further action, revoke all prior powers of attorney and
proxies appointed by the undersigned at any time with respect to such Shares
(and any such other Shares or securities or rights) and no subsequent powers of
attorney or proxies will be appointed by the undersigned, or be effective, with
respect thereto.
 
     The undersigned understands that the acceptance for payment by Parent of
tenders of Shares pursuant to any one of the procedures described in "THE TENDER
OFFER -- Procedure for Tendering Shares" of the Offer to Purchase and in
accordance with the Instructions hereto will constitute a binding agreement
between the undersigned and Parent upon the terms and subject to the conditions
of the Offer.
 
     Unless otherwise indicated herein under "Special Payment Instructions,"
please issue the check for the purchase price and/or return any certificates for
Shares not tendered or accepted for payment in the name(s) of the registered
holder(s) appearing under "Description of Shares Tendered." Similarly, unless
otherwise indicated under "Special Delivery Instructions," please mail the check
for the purchase price and/or return any certificates for Shares not tendered or
accepted for payment (and accompanying documents, as appropriate) to the
address(es) of the registered holder(s) appearing under "Description of Shares
Tendered."
 
     In the event that either or both of the Special Delivery Instructions and
the Special Payment Instructions are completed, please issue the check for the
purchase price and/or any certificates for Shares not tendered or accepted for
payment (and any accompanying documents, as appropriate) in the name of, and
deliver said check and/or return such certificates (and any accompanying
documents, as appropriate) to, the person or persons so indicated. The
undersigned recognizes that Parent has no obligation pursuant to the Special
Payment Instructions to transfer any Shares from the name of the registered
holder thereof if Parent does not accept for payment any of the Shares tendered
hereby.
 
     Unless otherwise indicated herein under "Special Delivery Instructions," in
the case of a book-entry delivery of Shares, please credit the account
maintained at the Book-Entry Transfer Facility with any Shares not accepted for
payment.
 
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        ---------------------------------------------------------------
 
                          SPECIAL PAYMENT INSTRUCTIONS
                        (SEE INSTRUCTIONS 1, 5, 6 AND 7)
 
        To be completed ONLY if certificates for Shares not tendered or not
   accepted for payment and/or the check for the purchase price of Shares
   accepted for payment are to be issued in the name of someone other than
   the undersigned.
 
   Issue check and/or certificate(s) to:
 
   Name: 
         ---------------------------------------------------------------
                                 (PLEASE PRINT)
 
   Address: 
            ------------------------------------------------------------
 
        ---------------------------------------------------------------
                               (INCLUDE ZIP CODE)
 
        ---------------------------------------------------------------
 
        ---------------------------------------------------------------
 
                         SPECIAL DELIVERY INSTRUCTIONS
                        (SEE INSTRUCTIONS 1, 5, 6 AND 7)
 
        To be completed ONLY if certificates for Shares not tendered or not
   accepted for payment and/or the check for the purchase price of Shares
   accepted for payment are to be sent to someone other than the undersigned
   or to the undersigned at an address other than that indicated above.
 
   Issue check and/or certificate(s) to:
 
   Name: 
         ---------------------------------------------------------------
                                 (PLEASE PRINT)
 
   Address:
            ------------------------------------------------------------
 
        ---------------------------------------------------------------
                               (INCLUDE ZIP CODE)
 
        ---------------------------------------------------------------
 
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                                   SIGN HERE
                   (ALSO COMPLETE SUBSTITUTE FORM W-9 BELOW)
 
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
                        (SIGNATURE(S) OF STOCKHOLDER(S))
 
                    Dated:                            , 1999
                          ---------------------------
 
     (Must be signed by registered holder(s) as name(s) appear(s) on the
certificate(s) for the Shares or on a security position listing or by person(s)
authorized to become registered holder(s) by certificates and documents
transmitted herewith. If signature is by trustees, executors, administrators,
guardians, attorneys-in-fact, officers of corporations or others acting in a
fiduciary or representative capacity, please provide the following information
and see Instruction 5.)
 
Name(s)
 
- --------------------------------------------------------------------------------
                                 (PLEASE PRINT)
 
Capacity (full title)
                     -----------------------------------------------------------
 
Address
 
- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)
 
Area Code and Telephone No.
                           -----------------------------------------------------
 
                           GUARANTEE OF SIGNATURE(S)
                      (IF REQUIRED SEE INSTRUCTIONS 1 & 5)
 
Authorized Signature
                     -----------------------------------------------------------
 
Name:
      --------------------------------------------------------------------------
                                 (PLEASE PRINT)
 
Name of Firm
 
Address
      --------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)
 
Area Code and Telephone No.
                           -----------------------------------------------------
 
Dated:                            , 1999
      ---------------------------
 
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                                  INSTRUCTIONS
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
     1. Guarantee of Signature. Except as otherwise provided below, all
signatures on this Letter of Transmittal must be guaranteed by a bank, broker,
dealer, credit union, savings association or other entity that is a member in
good standing of a recognized Medallion Program approved by The Securities
Transfer Association Inc. (each such entity an "Eligible Institution"). No
signature guarantee is required on this Letter of Transmittal (a) if this Letter
of Transmittal is signed by the registered holder(s) (which term, for purposes
of this document, shall include any participant in the Book-Entry Transfer
Facility whose name appears on a security position listing as the owner of
Shares) of Shares tendered herewith, unless such holder(s) has completed either
the box entitled "Special Delivery Instructions" or the box entitled "Special
Payment Instructions" on the reverse hereof, or (b) if such Shares are tendered
for the account of an Eligible Institution. See Instruction 5.
 
     2. Requirements of Tender. This Letter of Transmittal is to be completed by
stockholders either if certificates are to be forwarded herewith or, unless an
Agent's Message is utilized, if delivery of Shares is to be made pursuant to the
procedures for book-entry transfer set forth in "THE TENDER OFFER -- Procedure
for Tendering Shares" of the Offer to Purchase. For a stockholder validly to
tender Shares pursuant to the Offer, either (a) a properly completed and duly
executed Letter of Transmittal (or facsimile thereof), together with any
required signature guarantees (or an Agent's Message) and any other required
documents, must be received by the Depositary at one of its addresses set forth
herein prior to the Expiration Date and either (i) certificates for tendered
Shares must be received by the Depositary at one of such addresses prior to the
Expiration Date or (ii) Shares must be delivered pursuant to the procedures for
book-entry transfer set forth herein and a Book-Entry Confirmation must be
received by the Depositary prior to the Expiration Date or (b) the tendering
stockholder must comply with the guaranteed delivery procedures set forth below
and in "THE TENDER OFFER -- Procedure for Tendering Shares" of the Offer to
Purchase.
 
     Stockholders whose certificates for Shares are not immediately available or
who cannot deliver their certificates and all other required documents to the
Depositary or complete the procedures for book-entry transfer prior to the
Expiration Date may tender their Shares by properly completing and duly
executing the Notice of Guaranteed Delivery pursuant to the guaranteed delivery
procedures set forth in "THE TENDER OFFER -- Procedure for Tendering Shares" of
the Offer to Purchase. Pursuant to such procedures, (a) such tender must be made
by or through an Eligible Institution, (b) a properly completed and duly
executed Notice of Guaranteed Delivery substantially in the form provided by
Parent must be received by the Depositary prior to the Expiration Date, and (c)
the certificates for all physically delivered Shares or a Book-Entry
Confirmation with respect to all tendered Shares, as well as a properly
completed and duly executed Letter of Transmittal (or facsimile thereof) with
any required signature guarantees (or, in the case of a book-entry transfer, an
Agent's Message) and any other documents required by this Letter of Transmittal,
must be received by the Depositary within three New York Stock Exchange, Inc.
trading days after the date of execution of the Notice of Guaranteed Delivery.
 
     THE METHOD OF DELIVERY OF SHARES, THIS LETTER OF TRANSMITTAL AND ALL OTHER
REQUIRED DOCUMENTS IS AT THE ELECTION AND RISK OF THE TENDERING STOCKHOLDER. IF
DELIVERY IS BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY
INSURED, IS RECOMMENDED. IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO
ENSURE TIMELY DELIVERY.
 
     No alternative, conditional or contingent tenders will be accepted and no
fractional Shares will be purchased. All tendering stockholders, by execution of
this Letter of Transmittal (or facsimile thereof), waive any right to receive
any notice of the acceptance of their Shares for payment.
 
     3. Inadequate Space. If the space provided herein is inadequate, the
certificate numbers and/or the number of Shares should be listed on a separate
schedule attached hereto.
 
     4. Partial Tenders (Applicable to Certificate Stockholders Only). If fewer
than all the Shares evidenced by any certificate submitted are to be tendered,
fill in the number of Shares that are to be tendered in the box
 
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entitled "Number of Shares Tendered." In any such case, new certificate(s) for
the remainder of the Shares that were evidenced by the old certificate(s) will
be sent to the registered holder, unless otherwise provided in the appropriate
box on this Letter of Transmittal as soon as practicable after the expiration of
the Offer. All Shares represented by certificates delivered to the Depositary
will be deemed to have been tendered unless otherwise indicated.
 
     5. Signatures on Letters of Transmittal; Stock Powers and Endorsements. If
this Letter of Transmittal is signed by the registered holder of the Shares
tendered hereby, the signature must correspond with the name as written on the
face of the certificate(s) without any change whatsoever.
 
     If any of the Shares tendered hereby are owned of record by two or more
joint owners, all such owners must sign this Letter of Transmittal.
 
     If any tendered Shares are registered in different names on several
certificates, it will be necessary to complete, sign and submit as many separate
Letters of Transmittal as there are different registrations of certificates.
 
     If this Letter of Transmittal or any certificates or stock powers are
signed by trustees, executors, administrators, guardians, attorneys-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity, such persons should so indicate when signing, and proper evidence
satisfactory to Parent of their authority so to act must be submitted.
 
     When this Letter of Transmittal is signed by the registered holder(s) of
the Shares listed and transmitted hereby, no endorsements of certificates or
separate stock powers are required unless payment is to be made to or
certificates for Shares not tendered or accepted for payment are to be issued to
a person other than the registered holder(s). Signatures on such certificates or
stock powers must be guaranteed by an Eligible Institution.
 
     If this Letter of Transmittal is signed by a person other than the
registered holder(s) of certificates listed, the certificates must be endorsed
or accompanied by appropriate stock powers, in either case signed exactly as the
name or names of the registered owner or owners appear on the certificates.
Signatures on such certificates or stock powers must be guaranteed by an
Eligible Institution.
 
     6. Stock Transfer Taxes. Parent will pay any stock transfer taxes with
respect to the transfer and sale of Shares to it or its order pursuant to the
Offer. If, however, payment of the purchase price is to be made to, or if
certificates for Shares not tendered or accepted for payment are to be
registered in the name of, any persons other than the registered holder(s), or
if tendered certificates are registered in the name of any person other than the
person(s) signing this Letter of Transmittal, the amount of any stock transfer
taxes (whether imposed on the registered holder(s) or such person) payable on
account of the transfer to such person will be deducted from the purchase price
unless satisfactory evidence of the payment of such taxes or exemption therefrom
is submitted.
 
     EXCEPT AS PROVIDED IN THIS INSTRUCTION 6, IT WILL NOT BE NECESSARY FOR
TRANSFER TAX STAMPS TO BE AFFIXED TO THE CERTIFICATES LISTED IN THIS LETTER OF
TRANSMITTAL.
 
     7. Special Payment and Delivery Instructions. If a check is to be issued in
the name of, and/or certificates for Shares not tendered or not accepted for
payment are to be returned to, a person other than the signer of this Letter of
Transmittal or if a check is to be sent and/or such certificates are to be
returned to a person other than the signer of this Letter of Transmittal or to
an address other than that shown above, the appropriate boxes on this Letter of
Transmittal should be completed.
 
     8. Waiver of Conditions. Subject to the terms of the Offer, Parent reserves
the absolute right in its sole discretion to waive any of the specified
conditions of the Offer, in whole or in part, in the case of any Shares
tendered.
 
     9. 31% Backup Withholding. Under U.S. Federal income tax law, a stockholder
whose tendered Shares are accepted for payment is required to provide the
Depositary with such stockholder's correct taxpayer
 
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identification number ("TIN") on Substitute Form W-9 below. If the Depositary is
not provided with the correct TIN, the Internal Revenue Service may subject the
stockholder or other payee to a $50 penalty. In addition, payments that are made
to such stockholder or other payee with respect to Shares purchased pursuant to
the Offer may be subject to a 31% backup withholding.
 
     Certain stockholders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. In order for a foreign individual to qualify as an exempt
recipient, the stockholder must submit a Form W-8, signed under penalties of
perjury, attesting to that individual's exempt status. A Form W-8 can be
obtained from the Depositary. See the enclosed "Guidelines for Certification of
Taxpayer Identification Number on Substitute Form W-9" for more instructions.
 
     If backup withholding applies, the Depositary is required to withhold 31%
of any such payments made to the stockholder or other payee. Backup withholding
is not an additional tax. Rather, the tax liability of persons subject to backup
withholding will be reduced by the amount of tax withheld, provided that the
required information is given to the Internal Revenue Service. If withholding
results in an overpayment of taxes, a refund may be obtained from the Internal
Revenue Service.
 
     The box in Part 3 of the Substitute Form W-9 may be checked if the
tendering stockholder has not been issued a TIN and has applied for a TIN or
intends to apply for a TIN in the near future. If the box in Part 3 is checked,
the stockholder or other payee must also complete the Certificate of Awaiting
Taxpayer Identification Number below in order to avoid backup withholding. Even
if the box in Part 3 is checked and the Certificate of Awaiting Taxpayer
Identification Number is completed, the Depositary will withhold 31% on all
payments made prior to the time a properly certified TIN is provided to the
Depositary. However, such amounts will be refunded to such stockholder if a TIN
is provided to the Depositary within 60 days.
 
     The stockholder is required to give the Depositary the TIN (i.e., social
security number or employer identification number) of the record owner of the
Shares or of the last transferee appearing on the transfers attached to, or
endorsed on, the Shares. If the Shares are in more than one name or are not in
the name of the actual owner, consult the enclosed "Guidelines for Certification
of Taxpayer Identification Number on Substitute Form W-9" for additional
guidance on which number to report.
 
     10. Requests for Assistance or Additional Copies. Requests for additional
copies of the Offer to Purchase, this Letter of Transmittal, the Notice of
Guaranteed Delivery, and the Guidelines for Certification of Taxpayer
Identification Number on Substitute Form W-9 should be directed to the
Information Agent at its address set forth below. Questions or requests for
assistance may also be directed to the Information Agent.
 
     IMPORTANT: THIS LETTER OF TRANSMITTAL OR A FACSIMILE COPY THEREOF (TOGETHER
WITH CERTIFICATES FOR, OR A BOOK-ENTRY CONFIRMATION WITH RESPECT TO, TENDERED
SHARES WITH ANY REQUIRED SIGNATURE GUARANTEES AND ALL OTHER REQUIRED DOCUMENTS)
MUST BE RECEIVED BY THE DEPOSITARY, OR THE NOTICE OF GUARANTEED DELIVERY MUST BE
RECEIVED BY THE DEPOSITARY, PRIOR TO THE EXPIRATION DATE.
 
                                       10
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- ------------------------------------------------------------------------------------------------------------------------
 
                                  PART 1--PLEASE PROVIDE YOUR TIN IN THE BOX AT RIGHT     ----------------------------
  SUBSTITUTE                      AND CERTIFY BY SIGNING AND DATING BELOW.                   SOCIAL SECURITY NUMBER
   FORM W-9
                                                                                                       OR
                                                                                          ----------------------------
                                                                                         EMPLOYER IDENTIFICATION NUMBER
                                ----------------------------------------------------------------------------------------
  DEPARTMENT OF THE TREASURY
  INTERNAL REVENUE SERVICE        PART 2 -- CERTIFICATION -- UNDER PENALTIES OF                    PART 3  --
                                  PERJURY, I CERTIFY THAT:                                      AWAITING TIN [ ]
                                  (1) THE NUMBER SHOWN ON THIS FORM IS MY CORRECT
                                      TAXPAYER IDENTIFICATION (OR I AM WAITING FOR A
                                      NUMBER TO BE ISSUED FOR ME) AND
                                  (2) I AM NOT SUBJECT TO BACKUP WITHHOLDING EITHER
                                      BECAUSE: (A) I AM EXEMPT FROM BACKUP WITHHOLDING,
                                      OR (B) I HAVE NOT BEEN NOTIFIED BY THE INTERNAL
                                      REVENUE SERVICE (THE "IRS") THAT I AM SUBJECT TO
                                      THE BACKUP WITHHOLDING AS A RESULT OF A FAILURE
                                      TO REPORT ALL INTEREST OR DIVIDENDS OR (C) THE
                                      IRS HAS NOTIFIED ME THAT I AM NO LONGER SUBJECT
                                      TO BACKUP WITHHOLDING.
                                ----------------------------------------------------------------------------------------

 

                                                                               
                                     CERTIFICATION INSTRUCTIONS -- YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN
  PAYER'S REQUEST FOR                NOTIFIED BY THE IRS THAT YOU ARE CURRENTLY SUBJECT TO BACKUP WITHHOLDING BECAUSE
  TAXPAYER IDENTIFICATION            OF UNDERREPORTING INTEREST OR DIVIDENDS ON YOUR TAX RETURN. HOWEVER, IF AFTER
  NUMBER (TIN)                       BEING NOTIFIED BY THE IRS THAT YOU ARE SUBJECT TO BACKUP WITHHOLDING, YOU RECEIVED
                                     ANOTHER NOTIFICATION FROM THE IRS THAT YOU ARE NO LONGER SUBJECT TO BACKUP
                                     WITHHOLDING, DO NOT CROSS OUT SUCH ITEM (2).
                                     SIGNATURE __________  DATE __________
- -----------------------------------------------------------------------------------------------------------------------

 
NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
      OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE REVIEW
      THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
      NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
 
            YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE
                        BOX IN PART 3 OF SUBSTITUTE FORM W-9.
 

                                                                                                             
- -----------------------------------------------------------------------------------------------------------------------
                            CERTIFICATE OF A PERSON AWAITING TAXPAYER IDENTIFICATION NUMBER
     I CERTIFY UNDER PENALTIES OF PERJURY THAT A TAXPAYER IDENTIFICATION NUMBER HAS NOT BEEN ISSUED TO ME, AND
     EITHER (1) I HAVE MAILED OR DELIVERED AN APPLICATION TO RECEIVE A TAXPAYER IDENTIFICATION NUMBER TO THE
     APPROPRIATE INTERNAL REVENUE SERVICE CENTER OR SOCIAL SECURITY ADMINISTRATION OFFICE OR (2) I INTEND TO MAIL
     OR DELIVER AN APPLICATION IN THE NEAR FUTURE. I UNDERSTAND THAT IF I DO NOT PROVIDE A TAXPAYER IDENTIFICATION
     NUMBER BY THE TIME OF PAYMENT, 31% OF ALL REPORTABLE PAYMENTS MADE TO ME WILL BE WITHHELD, BUT THAT SUCH
     AMOUNTS WILL BE REFUNDED TO ME IF I THEN PROVIDE A TAXPAYER IDENTIFICATION NUMBER WITHIN SIXTY (60) DAYS.

 

                                                                                                       
     SIGNATURE                                                            DATE
- --------------------------------------------------------------------------------------------------------------------

 
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     Questions and requests for assistance or additional copies of the Offer to
Purchase, this Letter of Transmittal and other tender offer materials may be
directed to the Information Agent as set forth below.
 
                    THE INFORMATION AGENT FOR THIS OFFER IS:
 
                             D. F. KING & CO., INC.
                                77 Water Street
                              New York, N.Y. 10005
                 Banks and Brokers Call Collect: (212) 269-5550
                   All Others Call Toll Free: (800) 829-6554
 
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