GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Century 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Control Valve Body Cover Replacement

Removal Procedure

    Important: Lock steering wheel in centered position with wheels straight ahead.

  1. Remove the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement in Engine Controls - 3.1L.
  2. Remove the engine mount struts. Refer to Engine Mount Strut Replacement in Engine Mechanical - 3.1L.
  3. Install the engine support fixture. Refer to Engine Support Fixture in Engine Mechanical - 3.1L.

    4. Object Number: 629687 Size: SH
  4. Disconnect the range selector cable from the cable bracket and range selector lever. Refer to Range Selector Lever Cable Replacement .
  5. Remove the top bolt from the transaxle side cover.

    6. Object Number: 678825 Size: SH
  6. Disconnect the transmission wiring harness connector (2).
  7. Remove the wire harness (3) from the wire harness retainer (1).
  8. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  9. Remove the left front tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.

    10. Object Number: 460829 Size: SH
  10. Remove the wheel speed sensor harness (1) from the 4 retainers (2) at the frame.

    11. Object Number: 161234 Size: SH
  11. Remove the transmission mount to frame nuts only. Refer to Transmission Mount Replacement .
  12. Remove the engine splash shield. Refer to Engine Splash Shield Replacement in Body Front End.

    13. Object Number: 357447 Size: SH
  13. Remove the stabilizer bolts and reposition the stabilizer. Refer to Stabilizer Shaft Replacement in Front Suspension.
  14. Remove the steering gear frame bolts and support the gear before lowering the frame. Refer to Steering Gear Replacement in Power Steering System.

    15. Object Number: 313776 Size: SH
  15. Separate the left ball joint (3) from the steering knuckle. Refer to Lower Control Arm Replacement in Front Suspension.
  16. Position the drain pan under the transaxle.

    17. Object Number: 797047 Size: SH
  17. Remove the left drive shaft (1) from the transaxle. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
  18. Secure the drive axle to the steering knuckle/strut.
  19. Support the left side of the frame with a jackstand.

    20. Object Number: 96002 Size: SH
  20. Loosen the engine mount lower nuts. Refer to Engine Mount Bracket Replacement in Engine Mechanical - 3.1L.
  21. Loosen the right center frame bolt only. Do NOT loosen the right front or right rear frame bolts. Refer to Frame Replacement in Frame and Underbody.
  22. Remove the left frame bolts.
  23. Adjust the jackstand to lower the left side of the frame until the frame hangs free. Remove the jack stand.
  24. Lower vehicle to access engine support fixture.
  25. Lower the engine/transmission assembly with the engine support fixture to gain access to the remaining side cover bolts.
  26. Raise the vehicle to access the side cover bolts.

    27. Object Number: 164786 Size: SH
  27. Remove the case side cover bolts (56-58).

    28. Object Number: 48208 Size: SH
  28. Remove the case side cover pan (53).
  29. Remove the case side cover gasket (54).
  30. Clean the case.
  31. Clean the side cover gasket mating surfaces.

Installation Procedure

    Object Number: 48208 Size: SH
  1. Install the case side cover gasket (54).
  2. Install the case side cover pan (53).

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


    Object Number: 164786 Size: SH
  3. Install the case side cover bolts (56-58) except for the top bolt.

    4. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).

  4. Use a jackstand to raise the left side of the frame and engine assembly into position.
  5. Install the left side frame bolts and tighten the right center frame bolt. Refer to Frame Replacement in Frame and Underbody.

    6. Object Number: 96002 Size: SH
  6. Install the engine mount lower nuts. Refer to Engine Mount Bracket Replacement in Engine Mechanical - 3.1L.

    7. Object Number: 161234 Size: SH
  7. Install the transaxle mount to frame nuts. Refer to Transmission Mount Replacement .
  8. Remove the jackstands from the frame.

    9. Object Number: 797047 Size: SH
  9. Install the left drive shaft (1) to the transaxle. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
  10. Remove the drain pan from under the transaxle.

    11. Object Number: 313776 Size: SH
  11. Install the ball joint nut (2) and the cotter pin (1). Refer to Lower Control Arm Replacement in Front Suspension.
  12. Install the steering gear frame bolts. Refer to Steering Gear Replacement in Power Steering System.

    13. Object Number: 357447 Size: SH
  13. Reposition the stabilizer and install the stabilizer bolts. Refer to Stabilizer Shaft Replacement in Front Suspension.
  14. Install the engine splash shield. Refer to Engine Splash Shield Replacement in Body Front End.

    15. Object Number: 460829 Size: SH
  15. Install the wheel speed sensor harness (1) to the 4 retainers (2) at the frame.
  16. Install the left front tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  17. Lower the vehicle.

    18. Object Number: 678825 Size: SH
  18. Connect the transaxle wiring harness connector (2).
  19. Install the wire harness (3) to the wire harness retainer (1).
  20. Install the transaxle top side cover bolt.

    21. Object Number: 629687 Size: SH
  21. Connect the range selector cable to the cable bracket and range selector. Refer to Range Selector Lever Cable Replacement .
  22. Remove the engine support fixture.
  23. Install the engine mount struts. Refer to Engine Mount Strut Replacement in Engine Mechanical - 3.1L.
  24. Install the throttle body air inlet duct. Refer to Air Cleaner Inlet Duct Replacement in Engine Controls - 3.1L.

    25. Notice: Refer to Transmission Overfill Notice in the Preface section.

  25. Inspect the fluid level and fill the transaxle as necessary.
  26. Inspect for fluid leaks.