GM Service Manual Online
For 1990-2009 cars only

    Caution: Refer to Safety Glasses Caution in the Preface section.

    Important: Synchronizer components are not interchangeable. Keep all the synchronizer components separate. The synchronizer hubs and the sliding sleeves are a selected assembly. Keep the hubs and the sliding sleeves together as originally assembled.


    Object Number: 1955732  Size: SH
  1. Scribe a mark on the synchronizer hub and on the sleeve. This will help you to reinstall the parts in the same position.

  2. Object Number: 1956857  Size: SH
  3. Remove the synchronizer retaining springs (1 and 3) from the synchronizer assembly (2) using a suitable tool.

  4. Object Number: 1956859  Size: SH
  5. Remove the synchronizer sleeve (1) and the keys (3) from the hub (2) by pressing against the inner hub (2).

Reverse Synchronizer

Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 1955732  Size: SH
  1. Scribe a mark on the synchronizer hub and on the sleeve. This will help you to reinstall the parts in the same position.

  2. Object Number: 1956861  Size: SH
  3. Remove the synchronizer retaining spring (2) from the synchronizer assembly (1) using a suitable tool.

  4. Object Number: 1956863  Size: SH
  5. Remove the synchronizer key retainer (1)
  6. Remove the synchronizer sleeve (2) from the hub (3) by pressing against the inner hub (3).
  7. Turn the hub (3) over. The keys (4) will slide out from the hub (3).

  8. Object Number: 1956866  Size: SH
  9. Remove the synchronizer key retainer (1) from the synchronizer sleeve (3).
  10. Discard the synchronizer key retainer.

  11. Remove the synchronizer retaining spring (2) from the synchronizer sleeve (3).