GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 23907 Slide Hammer with Bearing Adapter
    • J 36509 Detent Spring Plug Remover
    • J 41663 Transmission Assembly Pallet with Main Shaft Adapter

    Object Number: 760901  Size: SH
  1. Remove the backup lamp switch from the rear case.
  2. Remove the vehicle speed sensor from the rear case.

  3. Object Number: 716993  Size: SH
  4. Remove the shift shaft detent pin from the clutch housing.

  5. Object Number: 143317  Size: SH
  6. Using the J 36509 in the detent plug, and the J 23907 , remove the following components from the clutch housing:
  7. • The shift shaft detent plug
    • The shift shaft spring
    • The shift shaft plunger

    Object Number: 760903  Size: SH
  8. Remove the 5 bolts retaining the input shaft bearing retainer to the clutch housing.
  9. Use a suitable prying tool to remove the input shaft bearing retainer.
  10. Remove the input shaft retaining ring.

  11. Object Number: 760905  Size: SH
  12. Remove the input shaft seal from the input shaft bearing retainer.

  13. Object Number: 735876  Size: SH
  14. Remove the 9 bolts securing the clutch housing to the rear case.
  15. Notice:  Do not nick, scratch or damage the sealing surface. The sealing surface is a machined surface. Damage to the machined surface can cause leakage.

  16. Using a soft-face hammer, tap on the clutch housing in order to separate the clutch housing from the rear case.
  17. Remove the countershaft roller bearing from the countershaft.

  18. Object Number: 717194  Size: SH
  19. Remove the shift shaft roll pin from the shift shaft lever.
  20. • Rotate the shift shaft lever and the shift rail bushing.
    • Support the shift shaft end while driving out the shift shaft lever roll pin.
    • Allow the roll pin to clear the 2nd gear during removal.

    Object Number: 760907  Size: SH
  21. Remove the shift shaft socket roll pin.
  22. • Do not bend the shift rail when removing the roll pin.
    • Use a 5 mm (3/16 in) drift punch in order to remove the roll pin.
    • The roll pin will fall into the rear housing.

    Object Number: 760909  Size: SH
  23. Remove the following components:
  24. • The shift shaft
    • The shift shaft socket
    • The shift shaft lever
    • The shift rail bushing

    Object Number: 760912  Size: SH
  25. Rotate the 3rd/4th gear shift fork counterclockwise.
  26. Remove the 3rd/4th shift fork.
  27. The 5th/reverse gear shift fork and the 1st/2nd gear shift fork are removed after the rear case is removed.


    Object Number: 143298  Size: SH
  28. Install the rear case gear assembly on the J 41663 .
  29. Remove the 2 bolts attaching the reverse idler gear shaft retainer and the reverse idler shaft support collar to the rear case.

  30. Object Number: 717724  Size: SH
  31. Remove the bolts securing the main shaft bearing retainer to the center of the rear case.
  32. Remove the rear case from the gear assemblies.

  33. Object Number: 144202  Size: SH
  34. Remove the mainshaft bearing retainer.

  35. Object Number: 760915  Size: SH
  36. Remove the reverse idler gear assembly.
  37. Remove the 5th/reverse gear shift fork.
  38. Remove the 1st/2nd gear shift fork.
  39. Remove the countershaft from the J 41663 .
  40. Remove the mainshaft assembly from the J 41663 .

  41. Object Number: 760969  Size: SH
  42. Remove the mainshaft front bearing from the input shaft.