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2001 Ford Expedition Question: Rear Differential

 

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Visitor, 5.4L V8, Mechanicsville, VA, August 05, 2010, 18:29

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??

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