GM Service Manual Online
For 1990-2009 cars only

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


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

  2. Object Number: 38444  Size: SH
  3. Install the following parts:
  4. 2.1. The synchronizer sleeve to the hub (Align the key openings in the hub with the cuts in the synchronizer sleeve.)
    2.2. The keys with the slots facing the hub

    Object Number: 38443  Size: SH
  5. Assemble the following parts:
  6. 3.1. The first spring (Assemble the spring tang to one of the key slots.)
    3.2. The second spring (Assemble the spring tang on the same key but in the opposite direction.)

Reverse Synchronizer


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

  2. Object Number: 38444  Size: SH
  3. Install the following parts:
  4. 2.1. The synchronizer sleeve to the hub (Align the key openings in the hub with the cuts in the synchronizer sleeve.)
    2.2. The keys with the slots facing the hub

    Object Number: 38443  Size: SH
  5. Assemble the following parts:
  6. 3.1. The first spring (Assemble the spring tang to one of the key slots.)
    3.2. The second spring (Assemble the spring tang on the same key but in the opposite direction.)

    Object Number: 38344  Size: SH
  7. Install a new synchronizer key retainer with the key retainer tangs over the synchronizer keys.