Transmission Jumps Out of 3rd Gear (Replace 3-4 Shift Fork, 3-4 Synchronizer Assembly, 3rd Gear Blocker Ring and 3rd Speed Gear)
| Subject: | Transmission Jumps Out of 3rd Gear (Replace 3-4 Shift Fork, 3-4 Synchronizer Assembly, 3rd Gear Blocker Ring and 3rd Speed Gear) |
| Models: | 1999-2000 Chevrolet Camaro |
| 1999-2000 Pontiac Firebird |
| with Manual Transmission (RPO MM6) |
This bulletin is being revised due to a change in part numbers. Please discard Corporate Bulletin Number 01-07-29-003 (Section 07 - Transmission/Transaxle).
Condition
Some owners may comment that the transmission jumps out of 3rd gear.
Cause
Condition may be caused by inadequate travel of the 3-4 synchronizer assembly due to the 3-4 shift fork being out of specification or bent.
Correction
Notice: Please review the appropriate section of the Transmission Unit Repair Manual for correct disassembly and assembly instructions. When performing this bulletin, ALL parts listed need to be replaced. The condition originally occurs because of the 3-4 shift fork being out of specification or bent. This eventually results in damage to the synchronizer assembly, the blocker ring and the speed gear.
Replace the 3-4 synchronizer assembly, the 3rd gear blocker ring, the 3rd speed gear and the 3-4 shift fork.
Parts Information
Part Number | Description | Qty |
|---|---|---|
12523207 | 3-4 Shift Fork | 1 |
12523078 | 3/4 Synchronizer Assembly | 1 |
12523186 | 3rd Gear Blocker Ring | 1 |
12523077 | 3rd Speed Gear | 1 |
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
K2752 | Gear -- R and R or Replace - 3rd Speed Gear | Use Published Labor Time |
