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Rear Differential on 2001 Ford Expedition

There is a whining noise coming from the back side of my 2001 Ford Expedition. It's more apparent when I accelerate the vehicle down the interstate. However, when I release the accelerator the noise lessens. I was told this could be the rear differential. Is this true and how much would something like this cost??

Asked by for the 2001 Ford Expedition
bearings bad in rear. about an 800-1000 repair.

Roy