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Old 09-26-2012, 09:01 PM   #1
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New Wrangler Owner With A Question

I have a 1999 Wrangler 4cyl. auto. with 133000 miles.I have replaced the front bearings along with the rear bearings. I am still hearing a humming noise comming from my rear diff. When the rear end was apart I did not have any metal in the fluid and the gears appeared to be fine but, I still have a humming sound. Everyone that heard the noise reccomended replacing the bearings so I did.

My question is how much noise should be expected. I understand this is an uninsulated vehicle but jusn need to know what to expect.

Thanks,
Randy
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Old 09-26-2012, 09:29 PM   #2
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Are you sure it's not tires? Put it on a pair of Jack stands and run it, to see if it goes away, or if it doesn't, to pin point where it's coming from.

Congrats on the new Jeep.

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Old 09-27-2012, 08:05 AM   #3
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Need more input: is your Jeep an automatic? does the " humming" noise sound louder on the drivers side or pass side?
as far as I know, your differentials should make no noise at all.
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Old 09-27-2012, 08:07 AM   #4
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Do you have a lift on it?
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Old 09-27-2012, 08:14 AM   #5
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Does the humming change pitch at different speeds. It may also change volume when there is no load on the drivetrain, i.e., up on stands. May be a pinion bearing gone bad.
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