GM Service Manual Online
For 1990-2009 cars only

Transmission Mount Replacement Left Mount

Removal Procedure

  1. Raise the vehicle. Support the vehicle. Refer to General Lifting and Jacking in General Information.

  2. Object Number: 98833  Size: SH
  3. Remove the bolt attaching the mount to the frame.

  4. Object Number: 98418  Size: SH
  5. Remove the bolts attaching the mount to the transmission.
  6. Remove the front transmission mount and the oil cooler bracket.

Installation Procedure


    Object Number: 98418  Size: SH
  1. Install the front transmission mount and the oil cooler bracket to the transmission.
  2. Tighten
    Tighten the bolts to 58 N·m (43 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: 98833  Size: SH
  3. Install the through bolt attaching the mount to the frame.
  4. Tighten
    Tighten the bolts to 85 N·m (63 lb ft).

  5. Remove the support stands.
  6. Lower the vehicle.

Transmission Mount Replacement Right Mount

Removal Procedure

  1. Raise the vehicle. Support the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
  2. Remove the exhaust system. Refer to Exhaust System .
  3. Remove the manifold-to-crossover pipe.
  4. Remove the steering rack retaining bolts.
  5. As necessary, position the steering rack away from the mount.
  6. Support the transmission with the transmission jack.

  7. Object Number: 98420  Size: SH
  8. Remove the through bolt and the nut.
  9. Remove the mount-to-frame nuts and bolts.
  10. Remove the mount from the frame.
  11. Remove the mount-to-transmission bolts.
  12. Remove the mount from the transmission.

Installation Procedure


    Object Number: 98420  Size: SH
  1. Install the mount to the transmission.
  2. Tighten
    Tighten the bolts to the transmission to 110 N·m (81 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.

  3. Install the mount to the frame.
  4. Tighten
    Tighten the mount-to-frame nuts and bolts to 73 N·m (54 lb ft).

  5. Install the mount through bolt and nut.
  6. Tighten
    Tighten the through bolt to 102 N·m (75 lb ft).

  7. Remove the transmission jack.
  8. Install the steering rack.
  9. Install the manifold crossover pipe.
  10. Install the exhaust system. Refer to Exhaust System .
  11. Lower the vehicle.

Transmission Mount Replacement Rear Mount

Removal Procedure

Tools Required

    • J 28467-360 Universal Support Fixture
    • J 28467-94 Engine Support Fixture Adapters
    • J 28467-330 Engine Support Adapters
    • J 28467-350 Engine Support Fixture Adapter
  1. Raise the vehicle. Support the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
  2. Install the jack stand in order to support the powertrain.
  3. Remove the left front tire and wheel. Refer to Wheel Removal in Tires and Wheels.
  4. Remove the nuts attaching the mount bracket to the mount.

  5. Object Number: 98416  Size: SH
  6. Remove the bolts attaching the mount bracket to the transmission.

  7. Object Number: 98417  Size: SH
  8. Remove the bolts attaching the left-side mount to the frame. Then, remove the mount.

Installation Procedure


    Object Number: 98417  Size: SH
  1. Install the mount to the frame. Install the bolts.
  2. Tighten
    Tighten the mount bolts to 50 N·m (37 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: 98416  Size: SH
  3. Install the bracket and the bolts to the transmission.
  4. Tighten
    Tighten the bracket-to-transmission bolts to 58 N·m (43 lb ft).

  5. Install the nuts that secure the brace to the mount.
  6. Tighten
    Tighten the bracket-to-mount nuts to 40 N·m (29 lb ft).

  7. Install the left tire and wheel. Refer to Wheel Installation in Tires and Wheels.
  8. Remove the jack stand.
  9. Lower the vehicle.