1996 GMC Sierra 2500 4X4 Won't shift into overdrive

Asked by Dec 01, 2013 at 03:01 PM about the GMC Sierra 1500

Question type: Maintenance & Repair

Transmission fluid is full, it did sit for almost 2 years, now on the road w/new fuel injection
pump and fuel pump runs and starts fine but won't shift into overdrive.

2 Answers

108,675

Could be stopped up trans filter and needs to be replaced. But with it having set for two years Might want to try some sea foam trans tune first.

1,835

Over drive switch...../ button stuck

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