GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Park Avenue 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Forward Servo Replacement

Removal Procedure
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the power steering gear heat shield.
  3. Remove the power steering rack and pinion and hang the power steering rack and pinion from the exhaust pipe. Refer to Steering Gear Replacement in Power Steering.
  4. Remove the transaxle mount lower bolts. Refer to Transmission Mount Replacement .
  5. Remove the engine mount lower bolts. Refer to Engine Mount Replacement in Engine Mechanical.
  6. Remove the power steering lines from the right side of the frame.
  7. Support the rear of the frame with a jackstand.
  8. Loosen the front frame bolts. Refer to Frame Replacement in Frame and Underbody.
  9. Adjust the jackstand to lower the rear of the frame.
  10. Position a drain pan under the forward servo cover.

    11. Object Number: 164777 Size: SH
  11. Remove the bolts and/or screws attaching the servo cover to the transaxle case.
  12. Remove the forward servo cover.
  13. Remove the forward servo cover O-ring.
  14. Remove the servo piston assembly.
  15. Remove the servo spring.

Installation Procedure

    Object Number: 164777 Size: SH
  1. Install the servo spring.
  2. Install the servo piston assembly.
  3. Install the forward servo cover O-ring.
  4. Install the forward servo cover.

    5. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the forward servo cover attaching bolts.

    6. Tighten
    Tighten the forward servo cover attaching bolts to 12 N·m (106 lb in).

  6. Remove the drain pan from under the forward servo cover.
  7. Adjust the jackstand to raise the rear of the frame.
  8. Install the frame bolts. Refer to Frame Replacement in Frame and Underbody.
  9. Remove the support from the rear of the frame.
  10. Install the power steering lines to the right side of the frame.
  11. Install the engine mount lower bolts. Refer to Engine Mount Replacement in Engine Mechanical.
  12. Install the transaxle mount lower bolts. Refer to Transmission Mount Replacement .
  13. Install the power steering rack and pinion. Refer to Steering Gear Replacement in Power Steering.
  14. Install the power steering gear heat shield.
  15. Lower the vehicle.

    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.

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