GM Service Manual Online
For 1990-2009 cars only

Transmission Mount Replacement AT Mount

Removal Procedure

Tools Required

J 28467-360 Engine Support Fixture

  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in Cautions and Notices.

  2. Object Number: 104328  Size: SH
  3. Install the J 28467-360 to the transmission.

  4. Object Number: 104331  Size: SH
  5. Remove the upper transmission support assembly bolts.
  6. Raise the vehicle. Support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  7. Remove the left front tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  8. Remove the left front splash shield. Refer to Wheelhouse Splash Shield Replacement in Body Front End.

  9. Object Number: 104358  Size: SH
  10. Remove the transmission mount expansion pipe bolt.

  11. Object Number: 104332  Size: SH
  12. Remove the lower transmission support assembly bolts.

  13. Object Number: 104358  Size: SH
  14. Remove the transmission support.

Installation Procedure


    Object Number: 104333  Size: SH
  1. Install the transmission support.

  2. Object Number: 104332  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the lower transmission support bolts.
  4. Tighten
    Tighten the bolts to 130 N·m (96 lb ft).


    Object Number: 104358  Size: SH
  5. Install the transmission mount expansion plug.
  6. Install the left front splash shield. Refer to Wheelhouse Splash Shield Replacement in Body Front End.
  7. Install the left front tire and the wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  8. Lower the vehicle.

  9. Object Number: 104331  Size: SH
  10. Install the upper transmission support assembly bolts.
  11. Tighten
    Tighten the bolts to 130 N·m (96 lb ft).


    Object Number: 104328  Size: SH
  12. Remove the engine support fixture.
  13. Connect the negative battery cable.

Transmission Mount Replacement Brace

Removal Procedure

  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in Cautions and Notices.
  2. Raise the vehicle. Support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the right front tire and the wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  4. Remove the right front splash shield. Refer to Wheelhouse Splash Shield Replacement in Body Front End.

  5. Object Number: 104360  Size: SH
  6. Remove the transmission brace bolts.

  7. Object Number: 104362  Size: SH
  8. Remove the transmission brace.

Installation Procedure


    Object Number: 104362  Size: SH
  1. Install the transmission brace.

  2. Object Number: 104360  Size: SH
  3. Install the transmission brace to engine bolts.
  4. Install the transmission brace to transmission bolts.
  5. Tighten
    Tighten the bolts to 66 N·m (49 lb ft).

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6. Install the right front splash shield. Refer to Wheelhouse Splash Shield Replacement in Body Front End.
  7. Install the right front tire and the wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  8. Lower the vehicle.
  9. Connect the negative battery cable.