GM Service Manual Online
For 1990-2009 cars only

1st/2nd Synchronizer


    Object Number: 4810  Size: SH
  1. Check the synchronizer assembly scribe marks for correct positions.

  2. Object Number: 1887573  Size: SH
  3. Install the synchronizer sleeve to the hub (align the insert openings in the hub with the cuts in the synchronizer sleeve).
  4. Install the inserts with the slots facing the hub.

3rd/4th, 5th/6th Synchronizers


    Object Number: 4810  Size: SH
  1. Check the synchronizer assembly scribe marks for correct positions.

  2. Object Number: 1887573  Size: SH
  3. Install the synchronizer sleeve to the hub (align the insert openings in the hub with the cuts in the synchronizer sleeve).
  4. Install the inserts with the slots facing the hub.

Reverse Synchronizer


    Object Number: 4810  Size: SH
  1. Check the synchronizer assembly scribe marks for correct positions.

  2. Object Number: 1887573  Size: SH
  3. Install the synchronizer sleeve to the hub (align the insert openings in the hub with the cuts in the synchronizer sleeve).
  4. Install the inserts with the slots facing the hub.

  5. Object Number: 1887579  Size: SH
  6. Install a new synchronizer insert retainer with the key retainer tangs over the synchronizer inserts.