Having problems with your 1996 GMC Suburban ?

1996 GMC suburban wont upshift.

\015 When speed reaches 20-30 mph the engine revs high and wont upshift anymore. I can feel the first two gears change but then after that nothing. I replaced the transmission filter on suggestion and replaced the fluid. Also replaced throttle position sensor on suggestion but problem persists. Was told to check the vacuum lines but im not a mechanic so im not sure what to do.\015 Posted / edited by AnonymousUser on : 15-10-2018

Answers :

When u changed the fluid was it dark /brownish and smelt burnt and was their filings or shavings on the magnet in pan if so more than likely your transmission may be fried---a bad vacuum that would cause shifting problems would also cause the truck to run rough and or stall
Repair Help & Product Troubleshooting for 1996 GMC Suburban

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