Document:

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                                                                   EXHIBIT 10.01

(AMERICAN AXLE & MANUFACTURING, INC. LETTERHEAD APPEARS HERE)

                                                                    CONFIDENTIAL

December 15, 1998, as amended January 11, 2000

Mr. B.G. Mathis
1840 Holbrook Avenue
Detroit, Michigan 48212

Dear Mr. Mathis:

This letter will confirm our understanding regarding the conditions applicable
to your retirement from American Axle & Manufacturing, Inc. (the "Company") at
such future date as shall be established.

This understanding takes into account and is in recognition of your significant
contributions to the process of acquiring the Company's assets from General
Motors and the subsequent success of the Company.

Upon your retirement, the following shall apply:

1.   You will be treated as having 10 years of service for all benefit
     eligibility and calculation purposes and shall receive retirement benefits
     supplemented by the Company's Supplemental Executive Retirement Plan equal
     to a total amount of $150,000 per full calendar year at the time of your
     retirement.

2.   You will continue to be provided a company car while serving on the
     Company's Board of Directors.

3.   Other terms and conditions of retirement shall be in accordance with those
     generally applicable to other senior executives of the Company.

The above items have been approved by the Board of Directors of the Company and
of AAMM.

                                         Very truly yours,

                                         By: /s/ Richard E. Dauch
                                                 ----------------
                                         Title: Chairman, Chief Executive
                                                 Officer and President<PAGE>   1
                                                                   EXHIBIT 10.02
                               AMENDMENT NO. 3 TO

 AAM/GMCL SUPPLY AGREEMENT BETWEEN AMERICAN AXLE & MANUFACTURING, INC. ("AAM")

      AND GENERAL MOTORS OF CANADA LIMITED ("GMCL") DATED FEBRUARY 17,1994,

                      AS AMENDED, (THE "SUPPLY AGREEMENT")

     WHEREAS GMCL entered into the Supply Agreement with AAM whereby AAM agreed
to source from GMCL for supply to GMCL and General Motors Corporation ("GMC")
those products described in the Supply Agreement;

     AND WHEREAS GMCL and AAM entered into Amendment No. 1, dated as of October
22, 1996, to extend the expiration of the Supply Agreement to September 21,
1999;

     AND WHEREAS GMCL and AAM entered into Amendment No. 2, an agreement dated
as of August 31, 1999, which amends the Supply Agreement to extend the
expiration of its term from September 21, 1999 to the later of (i) June 30,
2000, or (ii) the buildout of the C/K 400 series at the GMC Arlington Assembly
Plant;

     AND WHEREAS GMCL and AAM now wish to amend the Supply Agreement to extend
the term of the Agreement as set forth below.

     The parties hereto agree as follows:

     1. The term of the Supply Agreement is extended such that it will remain
in force and effect until September 17, 2002, unless earlier terminated pursuant
to Section 12 thereof. This agreement to extend the term of the Supply Agreement
amends and supersedes the expiration date set forth in Amendment No. 2 to the
Supply Agreement.

     2. AAM will transfer to GMCL, as a product to be supplied pursuant to the
Supply Agreement (and hereinafter be referred to as a "GMCL Axle" under the
Supply Agreement), all of AAM's requirements for the manufacturer of 8.6 inch
axles required by GMC for use in both the GMT 600 program and the portion of the
GMT 325/330 program referred to as the "Hi-Wider." AAM will also allocate and
GMCL will supply pursuant to the Supply Agreement, approximately *** axles per
day of 7 5/8 rear axles based on the present level of existing GMT 325/330
assembly plant utilization. It is understood that the scheduling of such GMCL
supplied 7 5/8 rear axles will be as specified by AAM and that such schedules
may be changed from time to time.

     3. Notwithstanding the Unit Prices set forth in Exhibit B to the Supply
Agreement, effective upon the execution of this agreement ("Amendment No. 3) the
price for each GMCL Axle manufactured by GMCL for AAM pursuant to the Supply
Agreement as amended, other than for GMT 400 series axles will be such that the
difference between the amount paid by AAM to GMCL for that GMCL Axle and the
*** for that GMCL Axle received by AAM from

                                                                              1
<PAGE>   2

GMCL and/or GMC will be *** from ***, calculated in U.S. funds.
This price increase will not apply to GMT 400 series axles, which shall remain
at *** (U.S. funds).

     4. GMCL will be responsible for all costs, such as the costs for capital
expenditures, tooling and facilities, required for GMCL to manufacture the
products for which GMCL is not facilitized.

     5. GMCL/GMC will pay *** million (U.S. Funds) to AAM upon the execution of
this Amendment No. 3, which AAM will use to purchase and install equipment such
as that shown in Exhibit A. All right, title and interest in such equipment will
belong to AAM. Purchase of this equipment is required by AAM due to the delayed
availability of similar equipment that AAM had intended to purchase in
accordance with the Option to Purchase Equipment Agreement dated February
18, 1994, between AAM and GMC but which now will be utilized by GMCL to
manufacture products during the term of this Amendment No. 3

     6. This Amendment No. 3 shall be effective upon execution by the parties.

     7. Except as expressly provided herein, all terms and conditions of the
Supply Agreement shall remain in full force and effect.

     8. This agreement may be executed by the parties in separate counterparts
each of which when so executed and delivered shall be an original, but all such
counterparts shall together constitute one and the same instrument.

Dated as of December 11, 1999

American Axle & Manufacturing, Inc.        General Motors of Canada Limited

By: /s/ B.G. Mathis                        By: /s/ L. Worrall
    ---------------                            --------------

Title: Executive Vice President            Title: Vice President-Purchasing &
       ------------------------                   ----------------------------
       Administration & Chief                     0perations
       Administrative Officer

General Motors Corporation

By: /s/ Barbara Whittaker
    ---------------------

Title: Executive Director - Metallic
       -----------------------------
                                                                              2

Executed on January 26, 2000.
<PAGE>   3
                                                                       EXHIBIT A
                                                                       ---------

Pinion Flange (Three Rivers)
          -  Core Drill
          -  (2) Breaches
          -  Lathe
          -  Transfer Line
          -  Assembly Machine
          -  Material Handling
          -  In-Process Gaging

S.S Stiff Shaft (Detroit G&A)
          -  Transfer Line
          -  (5) Lathes
          -  Spline Roller
          -  Induction Temperer
          -  Straightening Press
          -  (3) Grinders
          -  (2) Drills
          -  Mill, Chamfer, & Polisher
          -  Stud Press
          -  Current Tester
          -  Induction Heat Scanner
          -  Exhaust & Coolant System
          -  Parts Washer

Pinion Cell (Detroit G & A)
          -  (3) Gear Cutter - Roughers
          -  (5) Gear Cutter - Finishers
          -  Gear Chamferer

Flange Weld (Detroit G & A)
          -  (2) Welders

GMT360/370/355 (Buffalo G & A)
          -  (7) Lathes
          -  (2) Stampers
          -  (2) Dials
          -  (2) Spline Rollers
          -  (2) Chamferers
          -  Storage & Hdlg. System
          -  Gear Tester
          -  Coordinate Measuring Machine

Axis Shaft (Buffalo G & A)
          -  Temper/Draw
          -  Induction Temper
          -  (2) Induction Heat Scanners
          -  Drill
          -  Mill, Chamfer, Polish

Heat Treat (Buffalo G & A)
          -  Induction Temper
<PAGE>   4
                                                               EXHIBIT B
                                                               UPDATED 12/20/99
                                                               PAGE 1 OF 2

--------------------------------------------------------------------------------
                          ST. CATHARINES PART NUMBERS
--------------------------------------------------------------------------------
           PART                   LATEST SELLING
          NUMBER                   PRICE TO GM         CONTRACT#
--------------------------------------------------------------------------------
S-TRUCK
--------------------------------------------------------------------------------
         15161265                   ***              L6X0002N 000
--------------------------------------------------------------------------------
         15161266                   ***              L6X0002P 000
--------------------------------------------------------------------------------
         15161267                   ***              L6X0002R 000
--------------------------------------------------------------------------------
         15161268                   ***              L6X0002T 000
--------------------------------------------------------------------------------
         15161269                   ***              L6X0002V 000
--------------------------------------------------------------------------------
         15161270                   ***              L6X0002W 000
--------------------------------------------------------------------------------
         15755859                   ***              L6T000NJ 001
--------------------------------------------------------------------------------
         15755860                   ***              L6T000NK 001
--------------------------------------------------------------------------------
         26052402                                      CANCELED
--------------------------------------------------------------------------------
         26052403                                      CANCELED
--------------------------------------------------------------------------------
         26052404                   ***              L6X0003B 000
--------------------------------------------------------------------------------
         26052405                   ***              L6X0003C 000
--------------------------------------------------------------------------------
         26052407                   ***              L6X0003D 000
--------------------------------------------------------------------------------
         26052409                   ***              L6X0000L 002
--------------------------------------------------------------------------------
         26052410                   ***              L6X0003F 000
--------------------------------------------------------------------------------
         26052411                   ***              L6X0003G 000
--------------------------------------------------------------------------------
S/T HIWIDER/HYBRID
--------------------------------------------------------------------------------
         15007251                   ***              L6T000HG 002
--------------------------------------------------------------------------------
         15051682                                 Replaced by 15765093
--------------------------------------------------------------------------------
         15051683                                 Replaced by 15765094
--------------------------------------------------------------------------------
         15755996                   ***              L6T000P6 000
--------------------------------------------------------------------------------
         15755997                   ***              L6T000P7 000
--------------------------------------------------------------------------------
         15755998                                      CANCELED
--------------------------------------------------------------------------------
         15755999                                      CANCELED
--------------------------------------------------------------------------------
         15756000                                      CANCELED
--------------------------------------------------------------------------------
         15756001                   ***              L6T000PC 000
--------------------------------------------------------------------------------
         15756002                   ***              L6T000PD 000
--------------------------------------------------------------------------------
         15756003                                      CANCELED
--------------------------------------------------------------------------------
         15756004                                      CANCELED
--------------------------------------------------------------------------------
         15756005                   ***              L6T000PH 000
--------------------------------------------------------------------------------
         15756006                   ***              L6T000PJ 000
--------------------------------------------------------------------------------
         15758372                   ***              L6T000PZ 000
--------------------------------------------------------------------------------
         15760809                   ***              L6T000TM 000
--------------------------------------------------------------------------------
         15760810                   ***              L6T000TN 000
--------------------------------------------------------------------------------
         15760811                   ***              L6T000TP 000
--------------------------------------------------------------------------------
         15760812                   ***              L6T000TR 000
--------------------------------------------------------------------------------
         15765091                   ***              L6T000TT 000
--------------------------------------------------------------------------------
         15765092                   ***              L6T000TV 000
--------------------------------------------------------------------------------
         15765093                   ***              L6T000TW 000
--------------------------------------------------------------------------------
         15765094                   ***              16T000T3 000
--------------------------------------------------------------------------------
<PAGE>   5
                                                               EXHIBIT B
                                                               UPDATED 12/20/99
                                                               PAGE 2 OF 2

--------------------------------------------------------------------------------
                           ST. CATHARINES PART NUMBERS
--------------------------------------------------------------------------------
           PART               LATEST SELLING
          NUMBERS             PRICE TO GM                      CONTRACT 3
--------------------------------------------------------------------------------
   GMT 600
--------------------------------------------------------------------------------
          15753535               ***                           L6T000N7 000
--------------------------------------------------------------------------------
          15753536               ***                           L6T000N8 000
--------------------------------------------------------------------------------
          15759175               ***                           L6T000Nl 000
--------------------------------------------------------------------------------
          15759176               ***                           L6T000N2 000
--------------------------------------------------------------------------------
GMT420/425
--------------------------------------------------------------------------------
          15035035   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------
          15035036               ***                           HXT00012-000
--------------------------------------------------------------------------------
          15035045   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------
          15035051   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------
          15035052   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------
          15035057   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------
          15048487               ***                           HXT00012-000
--------------------------------------------------------------------------------
          15159151   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------
          15159153   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------
          15159165   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------
          15159167   NO FUTURE REQUIREMENTS (PHASED OUT)
--------------------------------------------------------------------------------

*  Portions of this Exhibit 10.02 were omitted and filed separately with the
   Secretary of the Securities and Exchange Commission (the "Commission")
   pursuant to an application for confidential treatment filed with the
   Commission pursuant to Rule 406 under the Securities Act of 1933, as
   amended.  Such portions are marked by the symbol "***".

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