Rear Differential Noise – Need help with diagnosis

[WOTStang]

I have a noise coming from a Ford 8.8″ rear differential. Has 80k miles on it and ive noticed a whirring coming from the rear differential while driving.

Key notes:

The noise does not change with acceleration or deceleration. No whining, clunking, chattering.. just a constant whirring noise. It does not change on turns, and there is no play in the drivetrain.

I lifted it up and took this video while running it in 4th gear up to about 60 mph.

[video]https://www.youtube.com/watch?v=rkyqSt2zUF4[/video]

Its definitely coming from behind the diff cover which makes me rule out axle bearings, however i have never heard a sound like this specifically. I can gladly give more details but i just wanted to get a quick idea if anyone has ever heard a noise like this before i get into more details.

Thanks in advance!

Topic

[WOTStang]

Here is another short video spinning it by hand: you can still hear the same noise.

[video]https://www.youtube.com/watch?v=g8TJbUt1KSo[/video]

[Author]

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