GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 512992  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement .
  3. Remove the rear servo assembly from the transmission case as follows:
  4. • Cover bolts (6)
    • Cover (5)
    • Cover gasket (4)
    • Bottom retaining clip (3)
    • Servo piston (2)
    • Outer ring oil seal (1)
    • Inner ring oil seal (7)
    • Accumulator piston (8)
    • Piston seal (9)
    • Washer (10)
    • Servo spring (11)
    • Servo spring retainer (12)
    • Selective pin (13)
    • Accumulator spring (14)

Installation Procedure


    Object Number: 512992  Size: SH
  1. Install the rear servo assembly to the transmission case as follows:
  2. • Accumulator spring (14)
    • Selective pin (13)
    • Servo spring retainer (12)
    • Servo spring (11)
    • Washer (10)
    • Piston seal (9)
    • Accumulator piston (8)
    • Inner ring oil seal (7)
    • Outer ring oil seal (1)
    • Servo piston (2)
    • Bottom retaining clip (3)
    • Cover gasket (4)
    • Cover (5)
    • Cover Bolt (6)

    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 cover bolts (61).
  4. Tighten
    Tighten the bolts to 24 N·m (18 lb ft).

  5. Install the transmission oil pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement .
  6. Lower the vehicle.
  7. Fill the transmission to the proper level with DEXRON® VI transmission fluid. Refer to Transmission Fluid Check .
  8. 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.

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