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Grinding noise when accelerating past 60 mph


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Hello, I have a 2002 gmc 2500 HD 6.6l 4wd. Recently I have been driving on the highway and at about 70 mph I’ll hear this grinding noise about where my transmission and drive shaft is. When I let off the gas it clunks then if I  immediately go back of the gas it will make a loud grinding noise again. If I’m driving at a lower speed it doesn’t do this. It’s starting to get louder and sound worst and now it’s doing it at about 60 mph, so I was wondering if anyone knows what it could be. I’m getting several different answers, anywhere from u joints to transfer case to even a bad Emergancy break. 

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