GM Service Manual Online
For 1990-2009 cars only

Mainshaft

Tools Required

    • J 36183 Press Tube
    • J 36184 Press Tube Adapter
    • J 39371 1ST/2ND Synchronizer Installer
    • J 39473 Bearing Installer/Press Adapter
    • Hydraulic Press
    • V-Blocks

    Object Number: 38329  Size: SH
  1. Install a new mainshaft small tapered bearing. Use the J 39473 , V-blocks, and a hydraulic press.

  2. Object Number: 38327  Size: SH
  3. Install the 3RD speed gear caged needle bearing and the spacer.

  4. Object Number: 4810  Size: SH
  5. Check the 3RD/4TH speed gear synchronizer assembly scribe marks for correct positions.
  6. Important: Install the 3RD/4TH synchronizer assembly as follows:

    1. Start the press operation.
    2. STOP pressing before the keys engage the blocking ring slots.
    3. Lift and rotate the 3RD speed gear in order to engage the keys with the blocking ring.
    4. Continue pressing until the synchronizer is seated.


    Object Number: 38330  Size: SH
  7. Install the following parts using the J 36183 , and the J 36184 and a hydraulic press:
  8. 4.1. The 3RD speed gear
    4.2. The 3RD speed gear blocking ring
    4.3. The 3RD/4TH speed gear synchronizer assembly (The groove on the sleeve faces the 3RD speed gear).
  9. Install the 3RD/4TH synchronizer retainer ring.

  10. Object Number: 38332  Size: SH
  11. Install the 2ND speed gear caged needle bearing.
  12. Important: Do the following when installing the 1ST/2ND synchronizer assembly:

    1. Start the press operation.
    2. Stop pressing before the keys engage the blocking ring slots.
    3. Lift and rotate the 2ND speed gear in order to engage the keys with the blocking ring.
    4. Continue pressing until the synchronizer is seated.


    Object Number: 98287  Size: SH
  13. Install the following parts using the J 39371 and a hydraulic press:
  14. 7.1. The 2ND speed gear
    7.2. The thrust washer
    7.3. The 2ND speed gear inner cone
    7.4. The friction cone
    7.5. The 2ND speed gear blocking ring
    7.6. The 1ST/2ND synchronizer assembly (The ID groove on the sleeve faces the 1ST speed gear.)

    Object Number: 38323  Size: SH
  15. Install the following parts:
  16. 8.1. The blocking ring
    8.2. The friction cone
    8.3. The inner cone
    8.4. The thrust washer
    8.5. The retainer ring

    Object Number: 38321  Size: SH
  17. Install the following parts:
  18. 9.1. The 1ST speed gear caged needle bearing
    9.2. The 1ST speed gear
    9.3. The mainshaft large tapered bearing and the O-ring seal

Input Shaft

Tools Required

    • J 5590 Press Tube
    • J 28537-17 Race Installer
    • Hydraulic Press

    Object Number: 38320  Size: SH
  1. Install a new bearing race on the input shaft. Use the J 28537-17 and a hydraulic press.

  2. Object Number: 38319  Size: SH
  3. Install a new tapered bearing on the input shaft. Use the J 5590 and a hydraulic press.