1991 GMC Vandura 3500 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1991 GMC Vandura 3500

1991 GMC Vandura 3500 Problems

Transmission 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.

Idling Problems Due to Vacuum Leak in Throttle Body Gasket

An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.

Internal Faults in Distributor Can Cause Engine Problems

The distributor may develop internal faults. This can cause a rough running engine or stalling condition, the Check Engine Light may or may not illuminate. Our technicians tell us that the distributor should be overhauled or replaced to correct this concern.

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1991 GMC Vandura 3500 Questions

Van keeps throwing Serpentine belt - any ideas? (2 answers)

When we purchased the van, the serpentine belt began coming off after hitting a large patch of water. Father-in-law, who was very mechanically savvy, said van had larger than normal alternator and needed a 955 belt instead of the recommended 945. Put on 955, ran great until a week ago, belt cam...

auto transmission replacement cost for 1991 GMC Vandura 3500 (1 answer)

It a passenger truck with no reverse. It runs forward ok but I want to replace the transmission instead of rebuilding it. Thanks.

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