Question about Chevrolet Cobalt
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Posted on Jan 02, 2017
SOURCE: 1993 Chevy Silverado 4x4 1500
If you have no overdrive at all, and virtually no third, then it's time for an overhaul. The 3-4 clutches have failed, a common problem in this trans since 1981. Yes, 1981. Your trans is a 4L60-E that is computer controlled. In 1981 it was called a THM700-R4, and was hydraulically controlled. The input clutch drum is basically the same as it was in 1981, and the 3-4 clutches are prone to failure, usually around 130,000 to 150,000 kms (75,000 to 90,000 miles).
Posted on Apr 18, 2011
SOURCE: 2004 S10 106K miles.
If your fluid levels and fuses are OK, there are shift solenoids in the trans that can be seen with the pan off. Might be one of those; usually the 3/4 drum breaks in those its just the weak point for them.
Additionally, GM has a bulletion out for it. GM has redesigned a harder part to prevent it from happening again.To fix it the transmission woild have to come out and be rebuilt or replaced.
Here is the bulletion:
#00-07-30-022D: No Reverse, Second Gear or Fourth Gear (Replace Reaction Sun Shell with More Robust Heat Treated Parts) - (Jun 10, 2008)
Subject: No Reverse, Second Gear or Fourth Gear (Replace Reaction Sun Shell with More Robust Heat Treated Parts)
1993-2005 GM Passenger Cars and Light Duty Trucks
2003-2005 HUMMER H2
with 4L60/65-E Automatic Transmission (RPOs M30 or M32)
This bulletin is being revised to add 2005 model year to the parts information. Please discard Corporate Bulletin Number 00-07-30-022C (Section 07 -- Transmission/Transaxle).
Condition: Some customers may comment on a no reverse, no second or no fourth gear condition. First and third gears will operate properly.
Cause: The reaction sun gear (673) may not hold inside the reaction sun shell (670).
Check this with your dealer or technician.
Keep us updated.
Posted on Jun 12, 2011
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