My 1990 sierra 4x4 wont go into overdrive. The engine just revs up. Other gears work fine.


Asked by Dec 21, 2013 at 10:12 AM about the 1990 GMC Sierra 1500 K1500 4WD Standard Cab LB

Question type: Maintenance & Repair

1 Answer

Tom Demyan

Your overdrive band internal to the transmission might be burned up. How is your fluid, dark and black? Have it checked out by a recommended mechanic or transmission expert to diagnose your problem. If in fact it is the band, your looking at a rebuild since you have to tear into the trans to replace it.

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