Synchronizers Assemble (M13)

If you are servicing this transmission for a shifting concern such as clash, hop out of gear, or block-out in a particular gear, the following hardware must be replaced as a set for the gear in question. Adjoining gears do not need to be serviced unless necessary:

• Main gear in question - for example 2nd, 3rd
• Synchronizer assembly, slider sleeve assembly
• Blocker ring assembly
• Shift fork inserts, pads

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

1. Courtesy of GENERAL MOTORS COMPANY

   Check the synchronizer assembly scribe marks for correct positions.

2. Courtesy of GENERAL MOTORS COMPANY

   Install the inserts (1) with the slots facing the hub.

3. Install the synchronizer sleeve (2) to the hub (3) (align the insert openings in the hub with the cuts in the synchronizer sleeve).

Reverse Synchronizer

1. Courtesy of GENERAL MOTORS COMPANY

   Check the synchronizer assembly scribe marks for correct positions.

2. Courtesy of GENERAL MOTORS COMPANY

   Install the inserts (3) with the slots facing the hub.

3. Install the synchronizer sleeve (1) to the hub (2) (align the insert openings in the hub with the cuts in the synchronizer sleeve).