1991 Chevrolet 3500 Pickup Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1991 Chevrolet 3500 Pickup
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1991 Chevrolet 3500 Pickup ProblemsTransmission Fluid Leak, Erratic Shifting
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.
The air conditioning compressor may develop an abnormal noise and require replacement. We recommend that whenever an AC compressor is being replaced for a noise condition, a filter kit should be installed to prevent any metal particles in the system from damaging the new compressor.
An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.
1991 Chevrolet 3500 Pickup QuestionsNo brake lights (2 answers)
Replaced the switch have followed the wires from cab to lights running down the frame cannot find any shorts that way. Any ideas on where to go now
8 bolts all have been removed but drum won't come off. help