GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 22828 Input and Countershaft Race Installer
    • J 22834-A Extension Housing Seal Installer

    Object Number: 789404  Size: SH
  1. Position the mainshaft in a soft jaw vice, with the output end up.
  2. Lubricate the 1st speed gear bearing with transmission fluid.
  3. Install the 1st speed gear bearing.
  4. Install the 1st speed gear, with the sector teeth facing down.

  5. Object Number: 789402  Size: SH
  6. Install the reverse gear clutch gear and the synchronizer ring. Ensure that the side of the synchronizer with ring teeth are toward the mainshaft shoulder.
  7. Install the reverse gear clutch gear retainer ring.

  8. Object Number: 789400  Size: SH
  9. Install the mainshaft bearing spacer on top of the retaining ring.
  10. Lubricate the reverse speed gear bearing with transmission fluid.
  11. Install the reverse speed gear bearing.

  12. Object Number: 789398  Size: SH
  13. Install the reverse gear assembly. Rotate the assembly until the gear drops into the fully seated position. If the synchronizer assembly was disassembled, the synchronizer sleeve must be reinstalled with the taper of the sleeve toward the reverse gear.
  14. Install the reverse gear thrust washer.
  15. Position the rear mainshaft bearing on the mainshaft.

  16. Object Number: 789441  Size: SH
  17. Using a hydraulic press and theJ 22828 , install the rear mainshaft bearing.
  18. Turn the mainshaft over and install it into a soft jaw vice, with the front facing up.

  19. Object Number: 789396  Size: MH
  20. Install the following 1st/2nd gear synchronizer components:
  21. • The 1st speed gear synchronizer outer ring retaining ring (11) in the lower groove
    • The 1st speed gear synchronizer inner ring (10)
    • The 1st speed gear outer ring retainer ring (9) in the second groove
    • The 1st speed gear synchronizer center ring (8)
    • Turn, to align in first gear.
    • The 1st speed gear synchronizer outer ring (7)
    • The 1st/2nd speed synchronizer assembly (6)
    • The tapered side of the sleeve faces up.
    • Turn the 1st speed gear synchronizer rings to align in the synchronizer assembly.
    • The 2nd speed gear synchronizer outer ring (5)
    • Turn the ring, to align the tabs in the synchronizer assembly.
    • The 2nd speed gear synchronizer center ring (4)
    • The 2nd speed gear synchronizer outer ring retaining ring (3) in the third groove
    • The 2nd speed gear synchronizer inner ring (2)
    • The 2nd speed gear synchronizer outer ring retaining ring (1) in the top groove

    Object Number: 100577  Size: SH
  22. Lubricate the 2nd speed bearing with transmission fluid.
  23. Install the 2nd speed gear bearing.

  24. Object Number: 102272  Size: SH
  25. Install the 2nd speed gear. Turn the gear, to align the inner synchronizer ring tabs in the gear.

  26. Object Number: 100575  Size: SH
  27. Install the following parts:
  28. 19.1. The 2nd speed gear thrust washer retaining pin
    19.2. The 2nd speed gear thrust washer

    Be sure the thrust washer is seated on the gear and the retaining pin.

    19.3. The 2nd speed gear thrust washer retainer ring

    Object Number: 100573  Size: SH
  29. Install the mainshaft bearing spacer.
  30. Lubricate the 3rd speed gear bearing with transmission fluid.
  31. Install the 3rd speed gear bearing.

  32. Object Number: 789443  Size: SH
  33. Using the J 22834-2A of J 22834-A , install the 3rd/4th synchronizer in the mainshaft. Align the synchronizer rings to the synchronizer while installing.

  34. Object Number: 789413  Size: SH
  35. Install the main drive gear thrust bearing.
  36. Install the 4th speed gear synchronizer ring.
  37. Install the 4th speed gear clutch gear.