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Rear End Whine Under Load

My 2000 Blazer has developed a whine in the rear when you push on the gas; i.e. when the drive train is under load. The whine tends to diminish or go away when you let off the gas and coast. I had a differential fluid leak which I fixed, and then refilled the differential with new gear oil; but the whine is still there. I am suspicious that the pinion gear bearing might have gotten worn when the fluid level was low. Or, that the pinion and ring gears might be worn - although there were no filings or obvious wear spots on the gears when I opened it up to check it out and replaced the gasket to fix the leak. Is there a way to differentiate the source of the whine; i.e. pinion bearings or gears. And is the bearing replacement a difficult project? From what I've read I don't think that I want to mess around with the gear replacement. Thanks a lot.

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  • Chevrolet Master
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Replacing gears and/or bearings in a differental is not an easy project. You'll need a press. The positioning of the gears requires a great deal of precision. Shims are used to acheve the correct setting. Preload setting on the pinion bearings is critical. I would recommend leaving this one to the experts.

Posted on Jul 13, 2013

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: rear diff leaking. how do i fill?

there is a fill plug on the side of the carrier housing on the nose of it, but if the rear end is noisy it is to late, u have damaged the gears or the bearings or both.

Posted on Mar 24, 2009

chuckster57
  • 1102 Answers

SOURCE: Have a rear end whine

Any time you do work on the ring and pinion set, there are precise specificatons and adjustments that have to be made. You did set the gear lash, and "preload" on the pinion bearing? If not then I would take it to a repair facility that you trust and is familiar with setting the specs. If the rear end ring/pinion gears are not set-up right, you can have a bigger problem that just whine.

Posted on May 13, 2011

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