Crazy rear end noise!! HELP!!

I've got a 96 2d 4x4 tahoe and the rear end started making some crazy grinding noises. It only happens when I let off the gas, but it's loud. Any help on what it could be and how to fix it would be greatly appreciated... thanks

Get a bottle of limited slip additive put it in My yukon had bad popping grinding noises its gone with additive also worked in my iroc. If this doesnt fix it then may be more severe also check rear u joint

Thanks, I'll try that today and see what it does.

Any vibrations that go along with it???

I had a crazy vibration and noise after replacing brake drums and U-joints at anything over 65mph and it ended up being the new drums were not perfectly round and off balance. The only way I found this out was to run it while sitting on jack stands with the tires and drums off. With something like this, do the same thing and see if you can pinpoint it while running in the air. obviously make sure you stay safe as this can be a very hazardous practice.

I've got a 96 2d 4x4 tahoe and the rear end started making some crazy grinding noises. It only happens when I let off the gas, but it's loud. Any help on what it could be and how to fix it would be greatly appreciated... thanks

Is it full of greese or any signs of leaking?
If it only does it on coast it does sound like rear end problem.
Here is a link that may help.
http://www.differentials.com/install.html

Have you checked the front pinion bearing or carrier bearings for being lose or bad?
MT

Sounds Like A U Joint