According to Terry Livermore in the July 8, 2000 Digest:
"Winding down or "coast down" whine or howl noises that go away when the accelerator is depressed are often caused by a loose or worn drive pinion bearing in the rear differential. These are usually loudest between 45 to 25 MPH. I once pulled the transfer case and driveshaft and drove a little to make sure before I decided where mine was coming from."
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