GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 44767 Seal Installer

Removal Procedure

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

  2. Object Number: 785877  Size: SH
  3. Remove the transmission manual shift shaft nut.
  4. Disconnect the shift linkage from the transmission manual shift shaft.
  5. Remove the exhaust system. Refer to Exhaust System Replacement .

  6. Object Number: 801931  Size: SH
  7. Disconnect the propeller shaft coupler (1) from the transmission flange. Refer to Rear Propeller Shaft Replacement .
  8. Push the front propeller shaft toward the rear of the vehicle in order to release the propeller shaft coupler (1) from the transmission flange.

  9. Object Number: 787650  Size: SH
  10. Secure the front propeller shaft (1) to the shift control lever (3) with a piece of mechanics wire (2).

  11. Object Number: 812779  Size: SH

    Important: Replace the shaft seal only if leaking.

  12. Using a small screwdriver, remove and discard the shaft seal.

  13. Object Number: 812777  Size: SH

    Important: Replace the cup plug only if leaking.

  14. Using a small screwdriver, remove and discard the cup plug.

  15. Object Number: 796172  Size: SH

    Important: Removal of the transmission from the vehicle is NOT required for removal or replacement of the shift shaft position switch. Remove the transmission from the vehicle and refer to Off-Vehicle Repair for replacement of the manual shift shaft ONLY if replacement of the manual shift shaft (3) is necessary.

  16. Remove the transmission fluid pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement .
  17. Disconnect the electrical connector from the manual shift shaft position switch.

  18. Object Number: 795841  Size: SH
  19. Using a suitable pin punch (1), remove the manual shift shaft position switch retaining pin (2).

  20. Object Number: 795840  Size: SH
  21. Remove the manual shift shaft detent spring (1) and bolts (2).
  22. Position a suitable transmission jack under the transmission support.
  23. Remove the transmission support from the body ONLY. Refer to Transmission Support Replacement .

  24. Object Number: 796173  Size: SH
  25. Using the transmission jack, lower the rear of the transmission only enough to allow the manual shift shaft (1) to clear the vehicle floor pan.
  26. Extract the manual shift shaft (1) from the transmission case only far enough to allow removal of the manual shift shaft position switch (6).
  27. Remove the manual shift shaft position switch (6), the manual shift shaft detent lever (4), the manual shift shaft assembly spacer (3), and the park pawl actuator (2) as an assembly.

Installation Procedure


    Object Number: 796173  Size: SH
  1. Install the manual shift shaft position switch (6), the manual shift shaft detent lever (4), the manual shift shaft assembly spacer (3), and the park pawl actuator (2) as an assembly. It may be necessary to push up on the park pawl in order to fully insert the park pawl actuator (2).
  2. Fully insert the manual shift shaft (1) into the transmission case.
  3. Raise the transmission to its original position.
  4. Install the transmission support. Refer to Transmission Support Replacement .
  5. Remove the transmission jack.

  6. Object Number: 795840  Size: SH
  7. Install the manual shift shaft detent spring (1).
  8. Install the control valve body bolts (2) retaining the manual shift shaft detent spring. Do not tighten at this time.

  9. Object Number: 795843  Size: SH
  10. Confirm that the manual shift shaft detent lever locating pin (2) is properly engaged with the manual valve link (1).
  11. Confirm that the detent spring roller (4) is properly engaged with the manual shift shaft switch (3).

  12. Object Number: 795841  Size: SH
  13. Using a suitable pin punch (1). Install the manual shift shaft position switch retaining pin (2).
  14. Connect the electrical connector to the manual shift shaft position switch.

  15. Object Number: 822502  Size: SH
  16. Install a 0.8 mm spacer (2) between the manual shaft detent lever (1) and the manual shaft detent spring (3).
  17. Notice: Refer to Fastener Notice in the Preface section.

  18. Tighten the detent spring bolts.
  19. Tighten
    Tighten the bolts to 11 N·m (97 lb in).

  20. Remove the spacer (2).
  21. Install the transmission fluid pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement .

  22. Object Number: 812780  Size: SH
  23. If previously removed, install a new shaft seal using J 44767 .
  24. Position the seal onto the J 44767 before installing the seal into the transmission case.
  25. Carefully slide the seal and tool over the manual shift shaft and insert the seal into the transmission until fully seated

  26. Object Number: 812778  Size: SH
  27. If previously removed, install a new cup plug. Lubricate the cup plug with transmission fluid before installation.
  28. Insert the cup plug into the transmission until flush with the transmission case.

  29. Object Number: 787650  Size: SH
  30. Remove the mechanics wire (2) securing front propeller shaft (1) to the shift control lever (3).

  31. Object Number: 801931  Size: SH
  32. Install the propeller shaft coupler (1) to the transmission flange. Refer to Rear Propeller Shaft Replacement .
  33. Install the exhaust system. Refer to Exhaust System Replacement .

  34. Object Number: 785877  Size: SH
  35. Connect the shift linkage to the transmission manual shift shaft.
  36. Install the transmission manual shift shaft nut.
  37. Tighten
    Tighten the nut to 9 N·m (80 lb in).

  38. Adjust the shift control linkage. Refer to Shift Control Linkage Adjustment .
  39. Lower the vehicle.
  40. 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.

  41. Reset the TAP values. Refer to Control Module References .