GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 29714-A Servo Cover Depressor

Removal Procedure


    Object Number: 858548  Size: SH
  1. Remove the exhaust pipe. Refer to Exhaust Manifold Pipe Replacement .
  2. Remove the heat shield bolts.
  3. Remove the heat shield.

  4. Object Number: 14478  Size: SH
  5. Remove the oil pan bolt below the servo.
  6. Install the J 29714-A .
  7. Tighten the bolt on J 29714-A in order to compress the servo cover.

  8. Object Number: 642680  Size: SH
  9. Remove the servo cover ring.
  10. Remove the J 29714-A .

  11. Object Number: 645364  Size: SH
  12. Remove the servo cover and O-ring seal. If the cover is hung up on the seal, use a pick (2) in order to pull and stretch the seal (1) out of the groove. Cut and remove the O-ring seal before removing the cover.

  13. Object Number: 642523  Size: SH
  14. Remove the 2-4 servo.
  15. Inspect the 4th apply piston, 2-4 servo converter, 2nd apply piston, and the servo piston inner housing for the following defects:
  16. • Cracks
    • Scoring
    • Burrs and nicks

Installation Procedure

  1. Install NEW seals onto the servo pistons and the servo cover.

  2. Object Number: 642523  Size: SH
  3. Install the 2-4 servo.
  4. Install the J 29714-A .

  5. Object Number: 14478  Size: SH
  6. Tighten the bolt on J 29714-A in order to compress the servo cover.
  7. Install the servo cover ring.
  8. Remove the J 29714-A .
  9. 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.

  10. Install the oil pan bolt.
  11. Tighten
    Tighten the bolt to 11 N·m (97 lb in).


    Object Number: 858548  Size: SH
  12. Install the heat shield and bolts.
  13. Tighten
    Tighten the bolts to 17 N·m (13 lb ft).

  14. Install the exhaust pipe. Refer to Exhaust Manifold Pipe Replacement .
  15. Fill the transmission to the proper level with DEXRON® VI transmission fluid. Refer to Transmission Fluid Check .
  16. Important: It is recommended that transmission adaptive pressure (TAP) information be reset.

    Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.

  17. Reset the TAP values. Refer to Transmission Adaptive Functions .