Car is falling out of third gear
02-05-2010, 04:34 PM
#1
Car is falling out of third gear Car falls out of third gear while letting of the gas then slowly start to throttle in again. Am i doomed to having a worn 3/4 syncro? Is there anything else i can look at? Clutch has 20K on it Spec 3+, fluid is full but might need bleeding. I know the fluid in the tranny is old.
02-06-2010, 12:10 AM
#2
Sounds like either the 3rd/4th gear synchro or the 3/4 shift fork. Either way you have the pull the trans apart, so you might as well figure on an overhaul, with new blockers, keys, pads, ect.
Worn trans fluid won't make it pop out of gear, and neither will the clutch.
Worn trans fluid won't make it pop out of gear, and neither will the clutch.
02-07-2010, 06:07 AM
#5
TECH Addict
There's a TSB on jumping out of third under the conditions you describe. It requires replacing the shift fork, blocker ring, synchro :
M/T - Jumps Out Of Third Gear
File In Section: 07 - Transmission/Transaxle
Bulletin No.: 01-07-29-003A
Date: May, 2001
TECHNICAL
Subject:
Transmission Jumps Out of 3rd Gear (Replace 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
Parts are currently available from GMSPO.
Warranty Information
M/T - Jumps Out Of Third Gear
File In Section: 07 - Transmission/Transaxle
Bulletin No.: 01-07-29-003A
Date: May, 2001
TECHNICAL
Subject:
Transmission Jumps Out of 3rd Gear (Replace 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
Parts are currently available from GMSPO.
Warranty Information
02-07-2010, 12:15 PM
#7
Just a side note; check to see if the shifter lever is hitting the bump stop or the console while in third gear. Probably not the case, since it's been 20K without issue, but, it's worth a look.
