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Q: Grinding noise on 2003 GMC Sierra 2500 HD

Grinding noise
Drive Train -- sergeant0018

I have a 2003 GMC Sierra 2500HD extended cab pickup truck. When driving for a period of time on a highway and i decelerate there is a grinding sound in the rear portion of the vehicle. When i tap the gas pedal it goes away. Recently i put the truck in reverse and there was another grinding sound and the truck didnt goe into reverse. Otherwise the vehicle shifts fine in all gears. Please Help
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