Document:

<PAGE>

                                                                    EXHIBIT 10.6

               SUPPLEMENT NO. 2 TO AMENDED AND RESTATED INDENTURE

          This SUPPLEMENT NO. 2 TO AMENDED AND RESTATED INDENTURE, dated as of
October 15, 2002 (this "Supplement"), is entered into among AMERICREDIT MASTER
TRUST, a Delaware business trust (the "Issuer"), BANK ONE, NA, a national
banking association, as trustee (the "Trustee") and as trust collateral agent
(the "Trust Collateral Agent"), and DEUTSCHE BANK TRUST COMPANY AMERICAS
(formerly known as Bankers Trust Company), as administrative agent (the
"Administrative Agent").

                                    RECITALS

          1.   The Issuer, Trustee, Trust Collateral Agent, and the
Administrative Agent are parties to that certain Amended and Restated Indenture
dated as of February 22, 2002 (as previously amended and as amended,
supplemented or otherwise modified from time to time, the "Indenture").

          2.   Pursuant to Section 9.1 of the Indenture, the parties hereto
desire to amend and supplement the Indenture without the consent of the Holders
of the Notes to increase the Class A Credit Score Enhancement Rate, the Class B
Credit Score Enhancement Rate and/or the Class C Credit Score Enhancement Rate.

          NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

          1.   Certain Defined Terms. Capitalized terms that are used herein
without definition and that are defined in the Indenture shall have the same
meanings herein as therein.

          2.   Amendments to Indenture. The Indenture is hereby amended by
deleting Schedule 2 thereto in its entirety and substituting, in lieu thereof,
Schedule 2 to this Supplement.

          3.   Effect of Supplement. Except as expressly amended and modified by
this Supplement, all provisions of the Indenture shall remain in full force and
effect. After this Supplement becomes effective, all references in the Indenture
and the Related Documents to "this Indenture" or words of similar effect
referring to the Indenture shall be deemed to be references to the Indenture as
amended by this Supplement. This Supplement shall not be deemed to expressly or
impliedly waive, amend or supplement any provision of the Indenture other than
as expressly set forth herein.

          4.   Effectiveness. This Supplement shall become effective as of the
date hereof upon receipt by the Trustee of counterparts of this Supplement
(whether by facsimile or otherwise) executed by each of the other parties hereto
and receipt by the Trustee of an opinion of counsel satisfying the requirements
of Section 9.3 of the Indenture.

          5.   Counterparts. This Supplement may be executed in any number of
counterparts and by different parties on separate counterparts, and each
counterpart shall be deemed to be an original, and all such counterparts shall
together constitute but one and the same instrument.

<PAGE>

          6.   Governing Law. This Supplement shall be governed by, and
construed in accordance with, the internal laws of the State of New York without
regard to any otherwise applicable principles of conflicts of law.

          7.   Section Headings. The various headings of this Supplement are
inserted for convenience only and shall not affect the meaning or interpretation
of this Supplement, the Indenture or any provision hereof or thereof.

          8.   Representations and Warranties. The Issuer represents and warrant
that (i) all of its representations and warranties set forth in the Indenture
are true and accurate in all material respects as though made on and as of the
date hereof (except representations and warranties which relate to a specific
date, which were true and correct as of such date) and (ii) no Event of Default
under the Indenture has occurred and is continuing.

                  [remainder of page intentionally left blank]

                                        2

<PAGE>

          IN WITNESS WHEREOF, the parties have executed this Supplement as of
the date first written above.

                                       AMERICREDIT MASTER TRUST, as Issuer

                                       By: DEUTSCHE BANK TRUST COMPANY DELAWARE,
                                       not in its individual capacity but solely
                                       as Owner Trustee on behalf of the Trust

                                       By:
                                             -----------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                             -----------------------------------

                                       BANK ONE, N.A., as Trust Collateral
                                       Agent and Trustee

                                       By:
                                             -----------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                             -----------------------------------

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

                                       By:
                                             -----------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                             -----------------------------------

                                       By:
                                             -----------------------------------
                                       Name:
                                             -----------------------------------
                                       Title:
                                             -----------------------------------

<PAGE>

          SCHEDULE 2

          UPDATED: EFFECTIVE OCTOBER 15, 2002

          "Class A Credit Score Enhancement Rate" means, as of any date, the sum
of (1) the Step-Up Percentage and (2) the greater of (a) 17.50% and (b) the
percentage set forth in the following table opposite the Net Spread as of such
date in the column in which the weighted average AmeriCredit Score for the
Eligible Receivables as of such date appears:

CLASS A

<TABLE>
<CAPTION>
                                         Weighted Average AmeriCredit Score
                     220-224           225 to 229        230-234           235-239           240+
Net Spread
<S>                  <C>               <C>               <C>               <C>               <C>
* 9.0%               34.00%            32.10%            33.00%            28.75%            18.50%
* 8.5% and ** 9.0%   34.20%            34.75%            36.00%            31.25%            21.50%
* 8.0% and ** 8.5%   35.00%            36.25%            36.90%            31.25%            24.75%
* 7.5% and ** 8.0%   37.60%            38.00%            37.75%            35.00%            25.00%
* 7.0% and ** 7.5%   37.20%            37.25%            38.50%            37.25%            26.25%
* 6.5% and ** 7.0%   41.70%            38.75%            38.50%            40.75%            29.50%
* 6.0% and ** 6.5%   42.40%            42.00%            41.00%            43.00%            34.00%
* 5.5% and ** 6.0%   48.10%            43.75%            40.00%            43.00%            34.00%
</TABLE>

* means greater than
** means less than or equal to

          "Class B Credit Score Enhancement Rate" means, as of any date, the sum
of (1) the Step-Up Percentage and (2) the greater of (a) 12.00% and (b) the
percentage set forth in the following table opposite the Net Spread as of such
date in the column in which the weighted average AmeriCredit Score for the
Eligible Receivables as of such date appears:

CLASS B

<TABLE>
<CAPTION>
                                         Weighted Average AmeriCredit Score
                     220-224           225 to 229        230-234           235-239           240+
Net Spread
<S>                  <C>               <C>               <C>               <C>               <C>
* 9.0%               26.60%            29.25%            29.50%            25.75%            15.00%
* 8.5% and ** 9.0%   26.90%            30.75%            32.00%            28.25%            17.50%
* 8.0% and ** 8.5%   27.70%            32.25%             32.9%            28.25%            20.75%
</TABLE>

* means greater than
** means less than or equal to

<PAGE>

<TABLE>
<S>                  <C>               <C>               <C>               <C>               <C>
* 7.5% and ** 8.0%   28.40%            33.25%            34.20%            31.25%            21.50%
* 7.0% and ** 7.5%   30.20%            33.25%            34.50%            33.25%            23.25%
* 6.5% and ** 7.0%   31.70%            34.00%            34.50%            36.75%            25.50%
* 6.0% and ** 6.5%   33.40%            35.75%            35.50%            39.00%            29.00%
* 5.5% and ** 6.0%   35.10%            36.50%            35.50%            39.00%            29.00%
</TABLE>

* means greater than
** means less than or equal to

          "Class C Credit Score Enhancement Rate" means, as of any date, the sum
of (1) the Step-Up Percentage and (2) the greater of (a) 5.50% and (b) the
percentage set forth in the following table opposite the Net Spread as of such
date in the column in which the weighted average AmeriCredit Score for the
Eligible Receivables as of such date appears:

CLASS C

<TABLE>
<CAPTION>

                               Weighted Average AmeriCredit Score
                     220-224           225 to 229        230-234           235-239           240+
Net Spread
<S>                  <C>               <C>               <C>               <C>               <C>
* 9.0%               18.00%            15.25%            12.50%             9.75%             8.50%
* 8.5% and ** 9.0%   20.50%            15.75%            13.00%            10.25%             8.50%
* 8.0% and ** 8.5%   20.60%            16.25%            13.90%            11.25%             8.50%
* 7.5% and ** 8.0%   20.50%            17.25%            14.70%            11.75%             9.50%
* 7.0% and ** 7.5%   21.00%            18.25%            15.50%            12.25%            10.00%
* 6.5% and ** 7.0%   21.50%            19.00%            16.50%            12.75%            10.50%
* 6.0% and ** 6.5%   22.00%            19.75%            17.50%            13.25%            11.00%
* 5.5% and ** 6.0%   22.50%            20.50%            18.50%            14.25%            12.00%
</TABLE>

* means greater than
** means less than or equal to

          "Class D Credit Score Enhancement Rate" shall have the meaning, if
any, set forth in a supplement or amendment to the Indenture.

          "Class E Credit Score Enhancement Rate" shall have the meaning, if
any, set forth in a supplement or amendment to the Indenture.

                                        2<PAGE>

                                                                    EXHIBIT 10.7

                                                                  EXECUTION COPY

                                 AMENDMENT NO. 1

                          dated as of December 1, 2002

                                      among

                       AMERICREDIT MTN RECEIVABLES TRUST,
                                   as Debtor,

                      AMERICREDIT FINANCIAL SERVICES, INC.,
                          Individually and as Servicer,

                           MBIA INSURANCE CORPORATION,
                                   as Insurer

                                       and

                         MERIDIAN FUNDING COMPANY, LLC,
                                  as Purchaser

                                       to

                               SECURITY AGREEMENT

                          dated as of December 18, 2000

<PAGE>

          AMENDMENT NO. 1, dated as of December 1, 2002 (the "Amendment"), among
AMERICREDIT MTN RECEIVABLES TRUST (the "Debtor"), AMERICREDIT FINANCIAL
SERVICES, INC., individually and in its capacity as Servicer ("AFS"), MBIA
INSURANCE CORPORATION, as Insurer ("MBIA"), and MERIDIAN FUNDING COMPANY, LLC,
as Purchaser ("Meridian"), to the Security Agreement dated as of December 18,
2000 (the "Security Agreement"), among the Debtor, AFS, AmeriCredit MTN Corp.
and The Chase Manhattan Bank (predecessor to JPMorgan Chase Bank), as Collateral
Agent and as Securities Intermediary.

          WHEREAS, Section 9.2(b) of the Security Agreement permits amendment of
the Security Agreement by the Debtor, AFS, MBIA and Meridian (the "Parties")
upon the terms and conditions specified therein;

          WHEREAS, the Parties wish to amend the Security Agreement.

          NOW, THEREFORE, the Parties agree that the Security Agreement is
hereby amended effective as of the date hereof as follows:

     Section 1. Definitions. Each term used but not defined herein shall have
the meaning assigned to such term in the Security Agreement.

     Section 2. Amendments to Section 1.1 (Certain Defined Terms).

          (a)    The definition of "Adjusted EBITDA" is deleted in its entirety.

          (b)    The definition of "Portfolio Repossession Ratio" is deleted in
its entirety and replaced with the following:

                 "Portfolio Repossession Ratio" means as of any date of
     determination a fraction, expressed as a percentage, equal to (i) the
     Aggregate Outstanding Balance of all repossessed Receivables included in
     the Servicing Portfolio as of the last Business Day of the related
     Settlement Period divided by (ii) the average Aggregate Outstanding Balance
     of the Servicing Portfolio during the related Settlement Period.

          (c)    The definition of "Servicing Fee" is deleted in its entirety
and replaced with the following:

                 "Servicing Fee" means, for any Settlement Period, the fee
     payable to the Servicer from Collections pursuant to Section 2.3(b) hereof
     on the related Remittance Date, in an amount equal to 2.25% per annum on
     the average daily Aggregate Outstanding Balance of the Receivables during
     such Settlement Period.

          (d)    The following definitions are inserted in Section 1.1 in
appropriate alphabetical order:

                 "EBITDA" means, with respect to AmeriCredit Corp., GAAP
     earnings before interest, taxes, depreciation and amortization.

                                        1

<PAGE>

                 "Ineligible Receivable" means any Receivable that is not an
     Eligible Receivable.

                 "Substitute Receivables Pool" means, on any Delivery Date, that
     portion of the Receivables comprising the Receivables Delivery having an
     Aggregate Outstanding Balance equal to the Aggregate Outstanding Balance of
     those Receivables that have become Ineligible Receivables since the most
     recent to occur of (i) the most recent preceding Delivery Date, (ii) the
     most recent preceding Take-Out Date and (iii) the most recent preceding
     Determination Date.

     Section 3. Amendment to Section 2.11 (Funding Account). Clause (i) of
Subsection 2.11(c) is amended by replacing the phrase "(y) the aggregate Net
Receivable Balance of all Receivables comprising the Receivables Delivery, but
in no event" contained therein with "(y) the Aggregate Outstanding Balance of
all Receivables comprising the Receivables Delivery less the Aggregate
Outstanding Balance of all Receivables comprising the Substitute Receivables
Pool, but in no event (1) an amount less than zero or (2)".

     Section 4. Amendments to Section 6.1 (Termination and Amortization Events).

          (a)    Clause (x) of Section 6.1 is deleted in its entirety and
replaced with the following:

                 (x)    the Tangible Net Worth of AmeriCredit Corp. shall be
     less than the sum of (a) $1,800,000,000 and (b) 75% of the cumulative
     positive net income (without deduction for negative net income) of
     AmeriCredit Corp. for each fiscal quarter having been completed since
     September 30, 2002, as reported in each annual report on Form 10-K and
     periodic report on Form 10-Q filed by AmeriCredit Corp. with the Securities
     and Exchange Commission; or

          (b)    Clause (z) of Section 6.1 is deleted in its entirety and
replaced with the following:

                 (z)    the ratio of AmeriCredit Corp.'s EBITDA (plus any loss
     provision minus net charge-offs) for the financial quarter ended December
     31, 2002 to its Interest Expense for the financial quarter ended December
     31, 2002 shall be less than 1.5x. The ratio of AmeriCredit Corp.'s EBITDA
     (plus any loss provision minus net charge-offs) for the financial quarter
     ended March 31, 2003 to its Interest Expense for the financial quarter
     ended March 31, 2003 shall be less than 1.8x. The average of the ratios of
     AmeriCredit Corp.'s EBITDA to Interest Expense for the two most recent
     financial quarters ended June 30, 2003 shall be less than l.0x. The average
     of the ratios of AmeriCredit Corp.'s EBITDA to Interest Expense for the two
     most recent financial quarters ended September 30, 2003 or December 31,
     2003 shall be less than 1.1x. The average of the ratios of AmeriCredit
     Corp.'s EBITDA to Interest Expense for the two most recent

                                        2

<PAGE>

     financial quarters ended March 31, 2004 and any two consecutive financial
     quarters thereafter shall be less than 1.2x; or

          (c)    Clause (jj) of Section 6.1 is deleted in its entirety and
replaced with the following:

                 (jj)   more than 30% of the Eligible Receivables held as
     Collateral have Contracts which provide for 72 monthly payments and such
     condition shall continue for five Business Days; or

     Section 5. Amendment to Exhibit M (Cumulative Net Loss Table). The entry of
"0.50%" in the "Trigger Rate" column, corresponding to a "Seasoning in Months"
of "3", is deleted and replaced with "1.25%".

     Section 6. Counterparts. This Amendment to the Security Agreement may be
executed in several counterparts, each of which shall be deemed an original
hereof and all of which, when taken together, shall constitute one and the same
Amendment to the Security Agreement.

     Section 7. Ratification of Security Agreement. Except as provided herein,
all provisions, terms and conditions of the Security Agreement shall remain in
full force and effect. As amended hereby, the Security Agreement is ratified and
confirmed in all respects.

     Section 8. Entire Agreement. This Amendment sets forth the entire agreement
between the Parties with respect to the subject matter hereof, and this
Amendment supersedes and replaces any agreement or understanding that may have
existed between the Parties prior to the date hereof in respect of such subject
matter.

                                        3

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date set forth on the first page hereof.

                                AMERICREDIT MTN RECEIVABLES TRUST

                                By: DEUTSCHE BANK TRUST COMPANY
                                 DELAWARE, not in its individual capacity but
                                 solely as Owner Trustee on behalf of the Issuer

                                By:               /s/ LOUIS BODI
                                   ---------------------------------------------
                                                                ATTORNEY-IN-FACT
                                   Name:             LOUIS BODl
                                   Title:          VICE PRESIDENT

                                AMERICREDIT FINANCIAL SERVICES, INC.,
                                 Individually and as Servicer,

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                MBIA INSURANCE CORPORATION,
                                 as Insurer,

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                MERIDIAN FUNDING COMPANY, LLC,
                                 as Purchaser

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date set forth on the first page hereof.

                                AMERICREDIT MTN RECEIVABLES TRUST

                                By: DEUTSCHE BANK TRUST COMPANY
                                 DELAWARE, not in its individual capacity but
                                 solely as Owner Trustee on behalf of the Issuer

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                AMERICREDIT FINANCIAL SERVICES, INC.,
                                 Individually and as Servicer,

                                By:  /s/ Beth Sorensen
                                   ---------------------------------------------
                                   Name:   Beth Sorensen
                                   Title:  Senior Vice President, Finance

                                MBIA INSURANCE CORPORATION,
                                 as Insurer,

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                MERIDIAN FUNDING COMPANY, LLC,
                                 as Purchaser

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date set forth on the first page hereof.

                                AMERICREDIT MTN RECEIVABLES TRUST

                                By: DEUTSCHE BANK TRUST COMPANY
                                 DELAWARE, not in its individual capacity but
                                 solely as Owner Trustee on behalf of the Issuer

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                AMERICREDIT FINANCIAL SERVICES, INC.,
                                 Individually and as Servicer,

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                MBIA INSURANCE CORPORATION,
                                 as Insurer,

                                By: /s/ Rosemary Kelley
                                   ---------------------------------------------
                                   Name:  Rosemary Kelley
                                   Title: Director

                                MERIDIAN FUNDING COMPANY, LLC,
                                 as Purchaser

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date set forth on the first page hereof.

                                AMERICRED1T MTN RECEIVABLES TRUST

                                By: DEUTSCHE BANK TRUST COMPANY
                                 DELAWARE, not in its individual capacity but
                                 solely as Owner Trustee on behalf of the Issuer

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                AMERICREDIT FINANCIAL SERVICES, INC.,
                                 Individually and as Servicer,

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                MBIA INSURANCE CORPORATION,
                                 as Insurer,

                                By:
                                   ---------------------------------------------
                                   Name:
                                   Title:

                                MERIDIAN FUNDING COMPANY, LLC,
                                 as Purchaser

                                By:              /s/ Andrew L. Stidd
                                   ---------------------------------------------
                                   Name:           Andrew L. Stidd
                                   Title:             President

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