GM Service Manual Online
For 1990-2009 cars only

1st/2nd, 3rd/4th, 5th/6th Synchronizers

    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: 4810  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: 1887573  Size: SH
  3. Remove the synchronizer inserts from the hub.

Reverse Synchronizer


    Object Number: 4810  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: 1887575  Size: SH
  3. Remove the synchronizer sleeve from the hub. Press against the inner hub.
  4. Turn the hub over. The inserts will slide out from the hub.

  5. Object Number: 1887577  Size: SH
  6. Using a small-blade screwdriver, remove the synchronizer key retainer, and discard.