On the 4L80-E Transmission (Diesel and 7.4L gas engine), Transmission fluid may leak through the electrical connector on the side of the transmission, damaging the wire harness and causing the transmission to shift erratically. Our technicians tell us there are updated shift solenoids, an internal transmission harness, and a connector pigtail available to correct this fault.
Transmission fluid leaking, erratic shifting on GMC Suburban 2500
Average mileage: 176,000 (176,000–176,000)
Drive Train affected: 4WD
3 people reported this problem
1 person shared problem details
1994 GMC Suburban 2500- 4WD176,000Visitor
The transmission only shifts past 2nd sometimes. We took it and had the codes pulled and they came back with TCC error, TCS circuit, trans code low gear ratio and trans code high gear ratio. We took it to a tranny shop and they drove it and looked it over and said it was in pretty good shape for a 94 with 176000 miles on it. Of course while they drove it the truck shifted fine. So now we are stuck trying to figure out exactly what is wrong and how to fix it.
The rear axle bearings have been known to wear grooves in the rear axle shafts, creating a grin...
i have can you tell if its your brake boost thats gone bad or your master cylinder
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases,...
I used the four wheel drive to get out of a parking lot where the snow was deep enough to get m...
The quick-connect fittings for the heater hoses tend to leak engine coolant. This problem commo...