Whining noise coming from Rear Diff area. - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 08-26-2013, 07:27 PM Thread Starter
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Whining noise coming from Rear Diff area.

I have an 04 F350 single wheel with a 10.5 rear end limited slip. It is making a whining/groaning noise. We put it up on jack stands at work and ran it up to 80 mph and it is pretty noisy, it seems to be coming from the rear end housing itself. The sound does not change pitch whether under throttle or not it stays constant all the way down to 10-15 mph. My first though was pinion bearing.. but I am unsure. 121k miles on the truck.

2004 350 SRW Supercab Longbed FX4
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