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Discussion Starter · #1 ·
So, I finally got around to putting on the new style diff cover and changing the oil to Pennzoil 75W-140. Now when I take tight turns it has a squealing whiny noise. The oil level is fine so I'm not sure what the problem would be.

Also the old oil was as black as night. I did change that after the first couple thousand miles....but it wasn't 75W-140, they didn't call for it back then. I'm at 33,000 miles now.


Thanks,
Chris
 

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Not sure why you would get a squeal when you turn from the rear diff. I have had a rear diff whine since I got my truck 2/14/2004. It is most noticeable without the radio on between 60 and 67 mph. Slower than that it is more muted, after 68 mph it is gone. I've got the PML cover and have used 75W140 since 5,000 miles. I've taken off the diff cover a few times, and see no evidence of excess wear on any of the gear teeth. I took a photo of the gears last time I took it off, but it says it is too big to post here.
 

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Discussion Starter · #3 ·
I dunno either, it is so loud I can hear it over my exhaust:teethmast
 
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