GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 8853-A Collar Installer
    • J 33369 Pilot
    • J 33374 Bearing Installer
    • J 22919 Bearing Installer

Important: 

   • Apply oil to the following areas before assembly:
      - The thrust surfaces on all of the gears
      - The collar surfaces
      - The race surfaces
      - The hub interior
      - The collar interior
      - The 3rd/4th gear interior
   • After assembly, apply oil to the collar exterior.
        Check that the insert springs do not interfere with the hub.


    Object Number: 107883  Size: SH
  1. Install the following parts for the 1st gear:
  2. The raised lip of the thrust washer faces the thrust bearing.

    • The thrust washer (1)
    • The thrust bearing (2)
    • The needle bearing (3)
    • The 1st gear (4)
    • The inner cone (5)
    • The outer cone (6)
    • The blocker ring (7)

    Object Number: 12504  Size: SH

    Important: Note the direction of the 1st/2nd/reverse gear synchronizer during installation. The fork groove on the sleeve faces input side.

  3. Align the inserts of the sleeve and hub assembly (1) with the grooves on the blocker ring. Ensure that the 1st gear side (2) is facing the 1st gear.
  4. Important: Line up all of the notches of cones, blocking ring, and synchronizer assembly during press.


    Object Number: 12503  Size: SH
  5. Press the 1st/2nd/reverse synchronizer assembly and the collar together using the J 8853-A , J 33369 and a hydraulic press.

  6. Object Number: 107884  Size: SH
  7. Install the following 2nd gear parts:
  8. • The needle bearing (4)
    • The blocker ring (1)
    • The outer cone (2)
    • The inner cone (3)
    • The 2nd gear (5)
    • The key (6)

    Object Number: 12507  Size: SH
  9. Align the key with the key groove on the 3rd/4th gear.
  10. Assemble the key and the 3rd/4th gear.
  11. Install the rear bearing on the output shaft using the J 33374 and a hydraulic press.

  12. Object Number: 12508  Size: SH
  13. Install the front bearing on the output shaft using the J 41676 and a press.
  14. Install as an assembly:
  15.    Important: Install the thrust washer with step facing the rear output shaft bearing.

    • Thrust washer
    • 5th gear bearing collar, use J 33374 and a press.
    • Install the 5th gear needle bearing.