Question about 1990 GMC Sierra

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My transmission on my 90 gmc sierra rwd will go into gear but the truck wont move the engine just revs up can anyone tell me whats wrong

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Slipping transmission

Posted on Apr 16, 2015

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Start up engine then put in gear look under truck and see if the drive shaft is turning drive shaft not turning then check oil in transmission if not low on oil smell and see if it is burnt if burnt it is broken or burnt up in side

Posted on Apr 16, 2015

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OH boy coudl be a few things, Does it work in R or reverse?
Have you checked the ATF level?
When did it start doing this?
Has it been say 6+ months since you drove it last?
If ATF is full and it has been awhile I would suggest starting it, putting tranny in N let it run for a few min, 3-5 then try D and R and see what Happens.
Could just be low fluid, Could be bad Pump located right behind teh Torque convertor, Could also be a broken spring, Piston or Clutch pack. OM Mopars (Dodge, Plymouth, Chrysler's) I have seen many a Band get messed up and I personally Smoked a clutch pack where I coudl drive f in 1,2,D,N but in R it would just bind up as it was trying to go both directions at once LOL.

Posted on Apr 16, 2015

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Hello, The first thing to check is the transmission fluid level. When you check the fluid does it have a burnt smell? If so, you probably have an internal failure. Have you had the transmission serviced? Your trans filter may be stopped up.
I hope this helps.
CYA, Gator241

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