Document:

<PAGE>

                                                                   Exhibit 10.39

                                  May 10, 2002

Bank One, NA
(Main Office Chicago)
1 Bank One Plaza, Suite IL 1-0594, 19/th/ Floor
Chicago, IL 60670-0594

       Re:  AmeriCredit One Trust - Security and Funding Agreement - Termination

Ladies and Gentlemen:

       Reference is made to that certain Security and Funding Agreement, dated
as of May 31, 2001 (as amended, supplemented or otherwise modified and in effect
from time to time, the "Agreement"), by and among AmeriCredit One Trust, as
borrower (the "Borrower"), Bank One, NA (Main Office Chicago), as Administrative
Agent, Bank One, NA (Main Office Columbus), as Collateral Agent and Securities
Intermediary, and the several secured parties party thereto from time to time.
Unless otherwise defined herein, all terms used herein which are defined in the
Agreement shall have the meanings assigned thereto in the Agreement.

       Pursuant to Section 9.7 of the Agreement, the Borrower hereby notifies
you that the Commitment Expiry Date shall be the date hereof and on such date,
the Secured Parties shall have received payment and performance in full of all
Secured Obligations, and no amounts remain due and owing by the Borrower, the
Sellers or the Servicer to the Administrative Agent and the Secured Parties
under any Basic Agreement; provided, however, that if the Agreement provides
that any term thereof shall survive termination of the Agreement, such term
shall survive termination of the Agreement hereby.

                                 Very truly yours,

                                 AMERICREDIT ONE TRUST
                                 By: Deutsche Bank Trust Company Delaware,
                                     formerly known as Bankers Trust (Delaware),
                                     not in its individual capacity but solely
                                     as Trustee

                                 By: _____________________________________
                                     Name:
                                     Title:<PAGE>

                                                                   Exhibit 10.47

May 22, 2002

Mr. Preston Miller
ACF Investment Corp.,
801 Cherry Street, Suite 3900
Fort Worth, Texas, 76102

 RE: ACF Investment Corp., a Delaware corporation
     4000 Embarcadero, Arlington, TX 76014 ("Property")
     Wells Fargo Bank Texas, Loan No. #27840E

 Dear Mr. Miller:

This Fifth Letter Modification Agreement dated May 22, 2002 ("Agreement") is
entered into by and between Wells Fargo Bank Texas, National Association
("Lender") and ACF Investment Corp., a Delaware corporation ("Borrower").

Pursuant to the terms of a construction loan agreement between Borrower and
Wells Fargo Bank, National Association ("Original Lender") dated June 29, 2001
("Loan Agreement"), Original Lender made a loan to Borrower in the principal
amount of Twenty Four Million Seven Hundred Eighty Thousand and 00/100ths
Dollars ($24,780,000.00) ("Loan"). Said Loan is secured by, among other things,
a Construction Deed of Trust with Absolute Assignment of Leases and Rents,
Security Agreement and Fixture Filing ("Deed of Trust") dated June 29, 2001,
executed by Borrower as "Grantor" for the benefit of Original Lender as
"Beneficiary" and recorded on July 30, 2001, as Instrument No. D201180713, in
the official records of Tarrant County, Texas encumbering real property
described more particularly therein; and evidenced by a Promissory Note dated
June 29, 2001 ("Note") and other documentation necessary to perfect the Loan and
any amendments or modifications thereto (individually and collectively, the
"Loan Documents"). Original Lender assigned its rights to Wells Fargo Bank
Texas, National Association ("Lender") by that certain Assignment of Promissory
Note and Deed of Trust dated September 24, 2001 and recorded September 26, 2001
as Instrument No. D201235560, in the official records of Tarrant County, Texas.

Said Loan was modified by that certain First Modification Agreement dated August
31, 2001 and recorded October 3, 2001 as Instrument No. D201241021 ("First
Modification Agreement"), Second Letter Modification dated November 7, 2001
("Second Letter Modification Agreement"), Third Letter Modification dated
February 8, 2002 ("Third Letter Modification Agreement"), and Fourth Letter
Modification Agreement dated March 19, 2002.

                                     Page 1

<PAGE>

Borrower has requested, and Lender has agreed to modify and amend certain terms
and provisions of the Note, Loan Agreement and Loan Documents.

MODIFICATION OF LOAN DOCUMENTS. The Loan Documents are hereby supplemented and
modified to incorporate the following, which shall supersede and prevail over
any conflicting provisions of the Loan Documents.

       Amendment to Maturity Date: The Maturity Date as recited in the Note,
       Loan Agreement and Loan Documents, is hereby modified from November 1,
       2002 to September 30, 2002.

       Amendment to the Loan to Value: The Loan to Value Percentage as stated in
       Section 2.8 of Loan Agreement, is hereby amended to reflect a maximum
       sixty-six and 3000/10000 percent (66.3%) ("Loan-to-Value Percentage")
       requirement.

       Amendment to Disbursement Plan - Disbursement of Construction Holdbacks:
       Effective immediately, the portion of the Disbursement Budget initially
       totalling $1,770,000.00, shall be available to Borrower and to be
       disbursed into the Account or to or for the benefit or account of the
       Borrower for the payment of related construction costs.

Lender's willingness to modify the Loan Documents is subject to the satisfaction
of the following conditions precedent:

1      Borrower shall deliver to Lender an unmodified, executed original of this
       Agreement;

2.     The payment to Lender of a modification fee in the amount of $250.00; and

3.     All payments due and owing to Lender under the Loan Documents have been
       paid current.

Except as amended herein, all other terms and conditions under each of the Loan
Documents shall remain unmodified and of full force and effect. Upon
satisfaction of the execution of this Agreement, the modification of the Loan
Documents shall be in effect.

                                     Page 2

<PAGE>

IN WITNESS WHEREOF, Borrower and Lender have caused this Agreement to be duly
executed as of the date first above written.

       "LENDER"

WELLS FARGO BANK TEXAS,
NATIONAL ASSOCIATION

By: /s/ Stephen C. Melton ---------------
    Stephen C. Melton, Vice President

       "BORROWER"

ACF INVESTMENT CORP.,
a Delaware corporation

By: /s/ Preston A. Miller----------------
    EVP and Treasurer

                                     Page 3<PAGE>

                                                                   Exhibit 10.59

                               JOINDER SUPPLEMENT

     JOINDER SUPPLEMENT, dated as of the date set forth in Item 1 of Schedule I
hereto, among the financial institution identified in Item 2 of Schedule I
hereto, AmeriCredit Financial Services, Inc. ("AmeriCredit"), individually, as a
Seller and as Servicer, AmeriCredit Funding Corp. VII("AFC"), individually and
as a Seller, AmeriCredit Master Trust (the "Issuer"), the Agent named in Item 5
of Schedule I hereto (the "Agent"), and Deutsche Bank Trust Company Americas,
formerly known as Bankers Trust Company, as Administrative Agent (the
"Administrative Agent").

                              W I T N E S S E T H:

     WHEREAS, this Supplement is being executed and delivered under the Amended
and Restated Class A-1 Note Purchase Agreement, dated as of February 22, 2002,
among AmeriCredit, AFC, the Issuer, the Class A-1 Purchasers from time to time
parties thereto, the Agents for the Purchaser Groups from time to time parties
thereto, and the Administrative Agent (as from time to time amended,
supplemented or otherwise modified in accordance with the terms thereof, the
"Agreement"; unless otherwise defined herein, terms defined in the Agreement are
used herein as therein defined); and

     WHEREAS, the party set forth in Item 2 of Schedule I hereto (the "Proposed
Purchaser") wishes to become a Class A-1 Purchaser designated as a Committed
Purchaser party to the Agreement;

     NOW, THEREFORE, the parties hereto hereby agree as follows:

     (a) Upon receipt by the Administrative Agent of five counterparts of this
Supplement, to each of which is attached a fully completed Schedule I and
Schedule II, each of which has been executed by the Proposed Purchaser,
AmeriCredit, AFC, the Issuer, the Agent and the Administrative Agent, the
Administrative Agent will transmit to the Proposed Purchaser, AmeriCredit, AFC,
the Issuer and the Agent, a Joinder Effective Notice, substantially in the form
of Schedule III to this Supplement (a "Joinder Effective Notice"). Such Joinder
Effective Notice shall be executed by the Administrative Agent and shall set
forth, inter alia, the date on which the joinder effected by this Supplement
shall become effective (the "Joinder Effective Date"). From and after the
Joinder Effective Date, the Proposed Purchaser shall be a Class A-1 Purchaser
designated as a Committed Purchaser party to the Agreement for all purposes
thereof.

     (b) Each of the parties to this Supplement agrees and acknowledges that at
any time and from time to time upon the written request of any other party, it
will execute and deliver such further documents and do such further acts and
things as such other party may reasonably request in order to effect the
purposes of this Supplement.

     (c) By executing and delivering this Supplement, the Proposed Purchaser
confirms to and agrees with the Administrative Agent, the Agents and the Class
A-1 Purchasers as follows: (i) none of the Administrative Agent, the Agents or
the Class A-1 Purchasers makes any representation or warranty or assumes any
responsibility with respect to any statements, warranties or representations
made in or in connection with the Agreement or the execution, legality,
validity, enforceability, genuineness, sufficiency or value of the Agreement or
any other

<PAGE>

instrument or document furnished pursuant thereto, or with respect to any notes
issued under the Indenture (including, without limitation, the Class A-1 Notes),
or the Trust Estate (as defined under the Indenture) or the financial condition
of AmeriCredit, AFC, any Seller, the Servicer, the Trustee, the Trust Collateral
Agent, the Backup Servicer or the Issuer, or the performance or observance by
AmeriCredit, AFC, any Seller, the Servicer, the Trustee, the Trust Collateral
Agent, the Backup Servicer or the Issuer of any of their respective obligations
under the Agreement, any other Related Document or any other instrument or
document furnished pursuant thereto; (ii) the Proposed Purchaser confirms that
it has received a copy of such documents and information as it has deemed
appropriate to make its own credit analysis and decision to enter into this
Supplement; (iii) the Proposed Purchaser will, independently and without
reliance upon the Administrative Agent, any Agent or any other Class A-1
Purchaser and based on such documents and information as it shall deem
appropriate at the time, continue to make its own credit decisions in taking or
not taking action under the Agreement; (iv) the Proposed Purchaser appoints and
authorizes the Agent to take such action as agent on its behalf and to exercise
such powers under the Agreement as are delegated to the Agent by the terms
thereof, together with such powers as are reasonably incidental thereto, all in
accordance with Article 7 of the Agreement; (v) the Proposed Purchaser appoints
and authorizes the Administrative Agent to take such action as agent on its
behalf and to exercise such powers under the Agreement as are delegated to the
Administrative Agent by the terms thereof, together with such powers as are
reasonably incidental thereto, all in accordance with the Indenture and Article
7 of the Agreement; and (vi) the Proposed Purchaser agrees (for the benefit of
the parties hereto and the other Class A-1 Purchasers) that it will perform in
accordance with their terms all of the obligations which by the terms of the
Agreement are required to be performed by it as a Class A-1 Purchaser designated
as a Committed Purchaser.

     (d) Schedule II hereto sets forth administrative information with respect
to the Proposed Purchaser.

     (e) This Supplement shall be governed by, and construed in accordance with,
the laws of the State of New York.

         IN WITNESS WHEREOF, the parties hereto have caused this Supplement to
be executed by their respective duly authorized officers on Schedule I hereto as
of the date set forth in Item 1 of Schedule I hereto.

                                      -2-

<PAGE>

                                                                   SCHEDULE I TO
                                                              JOINDER SUPPLEMENT

                          COMPLETION OF INFORMATION AND
                        SIGNATURES FOR JOINDER SUPPLEMENT

     Re:    Amended and Restated Class A-1 Note Purchase Agreement, dated as of
            February 22, 2002, among AmeriCredit Master Trust, AmeriCredit
            Funding Corp. VII, AmeriCredit Financial Services, Inc., the other
            parties thereto and Deutsche Bank Trust Company Americas, formerly
            known as Bankers Trust Company, as Administrative Agent.

Item 1: Date of Joinder Supplement:  May 10, 2002

Item 2: Proposed Purchaser:          Bank One, NA (Main Office Chicago)

Item 3: Type of Class A-1 Purchaser:      _____   CP Conduit
                                            X     Committed

Item 4: Complete if Committed Purchaser: Commitment - $10,000,000
                                            Committed Purchaser with respect to:
                                            Jupiter Securitization Corporation

Item 5: Name of Agent:            Bank One, NA (Main Office Chicago)

Item 6: Name of Purchaser Group:  Jupiter Purchaser Group

Item 7:      Signatures of Parties to Agreement:

                                         BANK ONE, NA (Main Office Chicago), as
                                         Proposed Purchaser

                                         By:____________________________________
                                            Name:
                                            Title:

<PAGE>

                                  AMERICREDIT FINANCIAL SERVICES,
                                  INC., individually, as Seller and as Servicer

                                  By:___________________________________________
                                     Name:
                                     Title:

                                  AMERICREDIT FUNDING CORP. VII,
                                  individually and as a Seller

                                  By:___________________________________________
                                     Name:
                                     Title:

                                  AMERICREDIT MASTER TRUST,
                                  By:   AmeriCredit Financial Services, Inc.,
                                        attorney-in-fact

                                  By:___________________________________________
                                     Name:
                                     Title:

                                  DEUTSCHE BANK TRUST COMPANY
                                  AMERICAS, formerly known as Bankers
                                  Trust Company, as Administrative Agent

                                  By:___________________________________________
                                     Name:
                                     Title:

                                  By:___________________________________________
                                     Name:
                                     Title:

                                  BANK ONE, NA (Main Office Chicago) as
                                  Agent

                                  By:___________________________________________
                                     Name:
                                     Title:

<PAGE>

                                                                  SCHEDULE II TO
                                                              JOINDER SUPPLEMENT

                        LIST OF INVESTING OFFICES, ADDRESS
                        FOR NOTICES AND WIRE INSTRUCTIONS

Address for Notices:  BANK ONE, NA (Main Office Chicago)
                      1 Bank Plaza, Suite IL 1-0594, 19/th/ Floor
                      Chicago, IL 60670-0594
                      Attention:  ABF Portfolio Management

Investing Office:     BANK ONE, NA (Main Office Chicago)
                      1 Bank Plaza, Suite IL 1-0594, 19/th/ Floor
                      Chicago, IL 60670-0594
                      Attention:  ABF Portfolio Management

Wire Instructions:    BANK ONE, NA
                      Chicago, IL
                      ABA#:  071 000 013
                      Conduit:  Jupiter
                      DDA Account #:  59-48118
                      Reference:  AmeriCredit Master Trust

<PAGE>

                                                                 SCHEDULE III TO
                                                              JOINDER SUPPLEMENT

                                     FORM OF
                            JOINDER EFFECTIVE NOTICE

<TABLE>
<S>  <C>                                           <C>
To:   BANK ONE, NA (Main Office Chicago)             AmeriCredit Financial Services, Inc.
      1 Bank Plaza, Suite IL 1-0594, 19/th/ Floor    801 Cherry Street-Suite 3900
      Chicago, IL 60670-0594                         Fort Worth, Texas 76102
      Attention:  ABF Portfolio Management

      AmeriCredit Funding Corp. VII                  AmeriCredit Master Trust
      801 Cherry Street-Suite 3900                   c/o AmeriCredit Financial Services, Inc.
      Fort Worth, Texas 76102                        801 Cherry Street-Suite 3900
                                                     Fort Worth, Texas 76102
</TABLE>

     The undersigned, as Administrative Agent under the Amended and Restated
Class A-1 Note Purchase Agreement, dated as of February 22, 2002, among
AmeriCredit Master Trust, AmeriCredit Funding Corp. VII, AmeriCredit Financial
Services, Inc., the other parties thereto and Deutsche Bank Trust Company
Americas, formerly known as Bankers Trust Company, as Administrative Agent,
acknowledges receipt of five executed counterparts of a completed Joinder
Supplement. [Note: attach copies of Schedules I and II from such Agreement.]
Terms defined in such Supplement are used herein as therein defined.

     Pursuant to such Supplement, you are advised that the Joinder Effective
Date for of Bank One, NA (Main Office Chicago) will be May 10, 2002 and such
Proposed Purchaser will be a Class A-1 Purchaser designated as a Committed
Purchaser with a Commitment of $10,000,000.

                                          Very truly yours,

                                          DEUTSCHE BANK TRUST COMPANY
                                          AMERICAS, formerly known as Bankers
                                          Trust Company, as Administrative Agent

                                          By:___________________________________
                                             Name:
                                             Title:

                                          By:___________________________________
                                             Name:
                                             Title:

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