GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 29714-A Servo Cover Depressor

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General information.
  2. Remove the oil pan bolt below and to the left of the 2-4 servo cover.
  3. Install the J 29714-A to the oil pan rail.

  4. Object Number: 14478  Size: SH
  5. Tighten the bolt on the J 29714-A in order to compress the servo cover.

  6. Object Number: 642680  Size: SH
  7. Remove the servo cover retaining ring.
  8. Loosen the bolt on the J 29714-A to release tension on the servo cover.

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

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

Installation Procedure


    Object Number: 642523  Size: SH
  1. Install the new seals on the pistons and the servo cover.
  2. Lubricate the seals with clean transmission fluid.
  3. Install the 2-4 servo assembly into the 2-4 servo bore.
  4. Install the servo cover and O-ring seal.
  5. Install the J 29714-A .

  6. Object Number: 14478  Size: SH
  7. Tighten the bolt on the J 29714-A in order to compress the servo cover.
  8. Install the servo cover retaining ring.
  9. Remove the J 29714-A from the oil pan flange.
  10. 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.

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

  13. Lower the vehicle.
  14. Fill the transmission to the proper level with approved fluid.
  15. Important: It is recommended that the 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 the TAP values. Transmission performance may be affected as new TAP values are learned.

  16. Reset the TAP values. Refer to Adapt Function .