Question about 1990 GMC Suburban
Tansmission will not stay in overdrive
Posted on Nov 25, 2008
Ok the 1st thing to do is change the fluid and filter, while the pan is off look for excess debris from the clutch packs, there will be some stuff in the pan, but if there is allot then the clutches are starting to fail and you will need an overhaul, how many miles on truck, 60,000 is recommended change for trans fluid, also use the latest GM approved Dextron 5 fluid, it is the best around and makes old transmissions shift much better, I used it in my 96 Corvette and what a difference!
Posted on Oct 13, 2008
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Posted on Jan 02, 2017
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