GM Service Manual Online
For 1990-2009 cars only

Transmission Mount Replacement Assembly

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 General Information.

  2. Object Number: 104328  Size: SH
  3. Install the J 28467-360 to the transmission. Raise the transmission enough in order to unload the transmission mounts.
  4. Raise the vehicle. Support the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
  5. Remove the left front wheel and tire assembly. Refer to Wheel Removal in Tires and Wheels.
  6. Remove the left splash shield.

  7. Object Number: 104230  Size: SH
  8. Remove the pipe expansion bolt from the transmission support assembly.

  9. Object Number: 104231  Size: SH
  10. Remove the transmission mount to body bolts.
  11. Lower the engine/transmission assembly just enough to be able to remove the transmission mount from the bracket.

  12. Object Number: 104235  Size: SH
  13. Remove the transmission mount.

Installation Procedure


    Object Number: 104235  Size: SH
  1. Install the transmission mount to the transmission bracket. Do not tighten the bracket until the mount is fastened to the body.
  2. Raise the engine and the transmission assembly.

  3. Object Number: 104231  Size: SH
  4. Install the transmission mount to body 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.


    Object Number: 104230  Size: SH
  6. Install the pipe expansion bolt to the transmission support assembly.
  7. Tighten
    Tighten to bolt to 55 N·m (41 lb ft).

  8. Install the left splash shield.
  9. Install the left front tire and wheel assembly. Refer to Wheel Installation in Tires and Wheels.

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