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Q:

transmission whines loudly in 1st gear and reverse, will not move in reverse. on 1999 GMC Yukon Denali

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will move in 1st and then runs fine and sounds fine after shifts to 2nd. what are possible causes and likely fixes.
(1) Answer
(4) Comments
Lo/reverse clutch worn, internal fluid leak in clutch apply circuit, let a trans. tech check it out but prob. no easy or external fix, worth a look though. Good luck!
Good start point. I had no clue. Thank You for the info.
There are a couple of tricks that might work but you need a transmission mechanic to check it not a trans. chain store.
Most places just want to swap it out, may need that but it is worth a look first!
Thanks again. I know an independent trans. mech. that can look at it next week.
Let us know what you find out and good luck with it!