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

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.

  1. Disconnect the negative battery cable.
  2. Remove the engine frame. Refer to Frame Replacement in Frame and Underbody.
  3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  4. Disconnect the transaxle electrical connector.
  5. Disconnect shift control cable bracket with cable attached.

    6. Object Number: 160965 Size: SH
  6. Remove the upper transaxle case to engine bolts (1-6).
  7. Remove the upper bolt from rear transaxle mount.
  8. Disconnect the oxygen sensor connector.
  9. Remove the engine frame. Refer to Frame Replacement in Frame and Underbody.
  10. Remove the left and right drive axles from the transaxle. Refer to Wheel Drive Shaft Replacement Driveline/Axle.
  11. Remove the torque converter cover. Refer to Torque Converter Cover Replacement .

    12. Object Number: 166594 Size: SH
  12. Remove the flywheel to torque converter bolts. Mark the flywheel to converter relationship to ensure proper reassembly. Refer to Flywheel to Torque Converter Bolt Replacement

    13. Object Number: 464391 Size: SH
  13. Disconnect Input speed sensor electrical connectors.
  14. Remove the engine to transaxle brace.

    15. Object Number: 166580 Size: SH
  15. Remove the transaxle fluid filler tube. Refer to Transmission Fluid Filler Tube Replacement .

    16. Object Number: 464333 Size: SH
  16. Remove the right transaxle mount.

    17. Object Number: 166598 Size: SH
  17. Remove the remaining transaxle to engine bolts.
  18. Remove the transaxle from vehicle using an appropriate transmission jack.
  19. Flush the transmission cooler and lines. Refer to Transmission Fluid Cooler Flushing and Flow Test .

Installation Procedure

    Object Number: 160965 Size: SH
  1. Install the transaxle into the vehicle.

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


    Object Number: 166598 Size: SH
  2. Install the lower transaxle case to engine bolts.

    3. Tighten
    Tighten the lower transaxle bolts to 75 N·m (55 lb ft).


    Object Number: 464333 Size: SH
  3. Install the right transaxle mount.

    4. Object Number: 166580 Size: SH
  4. Install the transaxle fluid filler tube. Refer to Transmission Fluid Filler Tube Replacement .

    5. Object Number: 464391 Size: SH
  5. Install the transaxle brace to engine.

    6. Tighten
    Tighten the transaxle brace to engine bolts to 60 N·m (44 lb ft).

  6. Connect the input speed sensor electrical connectors.

    7. Object Number: 166594 Size: SH

    Important: 

       • Align the mark made on the torque converter with the mark made on the flywheel made in the disassembly unless installing a new converter.
       • Tighten all the torque converter to flywheel bolts twice.

  7. Install the flywheel to torque converter bolts.

    8. Tighten
    Tighten the flywheel to torque converter bolts to 63 N·m (47 lb ft).


    Object Number: 166591 Size: SH
  8. Install the torque converter cover. Refer to Torque Converter Cover Replacement .

    9. Important: Use care when installing the right side drive axle into the transaxle case. The splined shaft of the drive axle can easily damage the seal.

  9. Install the left drive axle and the right drive axle to the transaxle. Refer to Wheel Drive Shaft Replacement in Driveline/Axle.
  10. Install the engine frame. Refer to Frame Replacement in Frame and Underbody.
  11. Connect the oxygen sensor connector.
  12. Lower the vehicle.
  13. Install the upper transaxle case to engine bolts.

    14. Tighten
    Tighten the upper transaxle bolts to 75 N·m (55 lb ft).

  14. Install the top bolt of the left transaxle mount.

    15. Tighten
    Tighten the left transaxle bolt to 58 N·m (42 lb ft).

  15. Connect the shift control cable and the shift control cable bracket.
  16. Check adjustment of the shift cables. Re-adjust as needed. Refer to Range Selector Lever Cable Adjustment .
  17. Connect the transaxle electrical connector.
  18. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  19. Connect the negative battery cable.
  20. Check and adjust the transaxle fluid level. Refer to Transmission Fluid Check .

    21. 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.

  21. Reset the TAP values. Refer to Adapt Function .
  22. Road test the vehicle and check for transaxle leaks.
  23. Check front end alignment.