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Discussion Starter · #1 ·
2001 4x4 with a whine from the front diff when under power. It goes away when coasting.
What could cause this and how can it be silenced?
I topped it off with 80w-140 gear lube with no change. I was about 6 oz low.
I do not know if the gear lube has ever been changed.
 

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I would start by changing the gear lube completely. Clean the housing out real good while you have it open.
 
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