GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 Century 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Forward Servo Replacement

Removal Procedure
  1. Install the engine support fixture. Refer to Engine Support Fixture in Engine Mechanical - 3.1L or Engine Support Fixture in Engine Mechanical - 3.8L.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove and support the power steering gear. Refer to Steering Gear Replacement in Power Steering System.
  4. Remove the transaxle mount lower nuts. Refer to Transmission Mount Replacement .
  5. Remove the engine mount lower nuts. Refer to Engine Mount Bracket Replacement in Engine Mechanical - 3.1L or Engine Mount and Bracket Replacement in Engine Mechanical - 3.8L.
  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 and remove the rear 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 servo cover bolts.
  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 spring.
  2. Install the piston assembly.
  3. Install the O-ring.
  4. Install the servo cover.

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

  5. Install the servo cover bolts.

    6. Tighten
    Tighten the bolts to 11 N·m (97 lb in).

  6. Remove the drain pan from under the forward servo cover.
  7. Adjust the jackstand in order 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 nuts. Refer to Engine Mount Bracket Replacement in Engine Mechanical - 3.1L or Engine Mount and Bracket Replacement in Engine Mechanical - 3.8L.
  12. Install the transaxle mount lower nuts. Refer to Transmission Mount Replacement .
  13. Install the power steering gear. Refer to Steering Gear Replacement in Power Steering System.
  14. Lower the vehicle.
  15. Remove the engine support fixture.
  16. Check and fill the transmission as necessary.

    17. 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 Adapt Function .