Synchronizers Assemble (MG9)

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 Synchronizer

Fig 1: View Of Alignment Marks On Synchronizer Hub & Synchronizer Sleeve
Courtesy of GENERAL MOTORS COMPANY
1. Check the synchronizer assembly scribe marks for correct positions.
Fig 2: Assembling 1st/2nd Synchronizer
Courtesy of GENERAL MOTORS COMPANY
2. Install the synchronizer sleeve (2) to the hub (3) (align the insert openings in the hub with the cuts in the synchronizer sleeve).
3. Install the inserts (1) with the slots facing the hub.

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

Fig 3: View Of Alignment Marks On Synchronizer Hub & Synchronizer Sleeve
Courtesy of GENERAL MOTORS COMPANY
1. Check the synchronizer assembly scribe marks for correct positions.
Fig 4: Identifying Synchronizer Inserts
Courtesy of GENERAL MOTORS COMPANY
2. Install the synchronizer sleeve to the hub (align the insert openings in the hub with the cuts in the synchronizer sleeve).
3. Install the inserts with the slots facing the hub.

Reverse Synchronizer

Fig 5: View Of Alignment Marks On Synchronizer Hub & Synchronizer Sleeve
Courtesy of GENERAL MOTORS COMPANY
1. Check the synchronizer assembly scribe marks for correct positions.
Fig 6: Identifying Synchronizer Inserts
Courtesy of GENERAL MOTORS COMPANY
2. Install the synchronizer sleeve to the hub (align the insert openings in the hub with the cuts in the synchronizer sleeve).
3. Install the inserts with the slots facing the hub.
Fig 7: View Of New Synchronizer Insert Retainer & Key Retainer Tangs
Courtesy of GENERAL MOTORS COMPANY
4. Install a new synchronizer insert retainer with the key retainer tangs over the synchronizer inserts.