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: 38444  Size: SH
  3. Install the synchronizer sleeve to the hub (align the key openings in the hub with the cuts in the synchronizer sleeve).
  4. Install the keys with the slots facing the hub.

  5. Object Number: 105696  Size: SH
  6. Assemble the first spring (assemble the spring tangs to the side of two keys).
  7. Assemble the second spring (assemble the spring tangs to the side of two keys such that the gap is not between the same two keys as the first spring).

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 synchronizer sleeve to the hub (align the key openings in the hub with the cuts in the synchronizer sleeve).
  4. Install the keys with the slots facing the hub.

  5. Object Number: 105696  Size: SH
  6. Assemble the first spring (assemble the spring tang to one of the key slots).
  7. Assemble 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 synchronizer sleeve to the hub (align the key openings in the hub with the cuts in the synchronizer sleeve).
  4. Install the keys with the slots facing the hub.

  5. Object Number: 105696  Size: SH
  6. Assemble the first spring (assemble the spring tang to one of the key slots).
  7. Assemble the second spring (assemble the spring tang on the same key but in the opposite direction).

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