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I purchased my 2001 GMC 2500 HD new, it now only has 54,000 miles. I noticed the rear-end tends to be worse as far as a singing/howling noise though second gear, which is a automatic. I have serviced it @ 20,000 miles with fresh synthetic oil. One odd thing that happened last winter when towing was my hanger bearing went out. Any input would be great, thanks Les........

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Well, I don't think it is your G80 specifically, but it may be your differential bearings, but I'm not pro so I'm just throwing that out there

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I assume the center carrier bearing

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Yes, center carrier, one piece drive shaft.

 

Has there been some bad differential bearings and or races getting warped at install?

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