Q: Four-wheel drive GMC Denali with a 5.7 liter. It has lost reverse and makes a very loud grinding noise when put in any gear. 1999 GMC Yukon Denali

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Very loud grinding noise when put in any gear reverse does not work only 3rd and 4th gear work grinding noises only while in gear

My car has 150000 miles.
My car has an automatic transmission.

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