Synchronizers Disassemble

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

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 and 2nd, 3rd and 4th, 5th and 6th Synchronizers

NOTE:

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.

Courtesy of GENERAL MOTORS COMPANY

Scribe a mark on the synchronizer hub (1) and on the sleeve (2). This will help you to reinstall the parts in the same position.
Courtesy of GENERAL MOTORS COMPANY

Remove the synchronizer sleeve (2) from the hub (3).
Remove the synchronizer inserts (1) from the hub.

Reverse Synchronizer

Courtesy of GENERAL MOTORS COMPANY

Scribe a mark on the synchronizer hub (1) and on the sleeve (2). This will help you to reinstall the parts in the same position.
Courtesy of GENERAL MOTORS COMPANY

Remove the synchronizer sleeve (2) from the hub (4). Press against the inner hub.
Using a small-blade screwdriver, remove and DISCARD the synchronizer key retainer (1).
Turn the hub over. The synchronizer inserts (3) will slide out from the hub.