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  #13  
Old 03-01-2012, 01:22 PM
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Re: Rear diff whine.... I think...

I had a whine, butthen one day my Jeeps rear diff just gave up. It's probably the wheel bearing. Make sure your servicing your Differentials or this could happen.
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  #14  
Old 03-01-2012, 01:36 PM
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Re: Rear diff whine.... I think...

The mechanic probably did not mark and count the turns he had to turn the flange nut when removing the pinion seal. If he got it to tight the crush bushing is compressed causing the backlash to be wrong. I always (years ago) marked the pinion and nut and counted the turns to remove, and reinstalled with the same amount of turns to keep the backlash correct.
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  #15  
Old 03-01-2012, 11:13 PM
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Re: Rear diff whine.... I think...

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Originally Posted by Don's GC View Post
The mechanic probably did not mark and count the turns he had to turn the flange nut when removing the pinion seal. If he got it to tight the crush bushing is compressed causing the backlash to be wrong. I always (years ago) marked the pinion and nut and counted the turns to remove, and reinstalled with the same amount of turns to keep the backlash correct.

It doesn't change backlash backlash is adjusted with the threaded adjusters on the carrier, its bearing preload that is the problem. When the bearings are preloaded so tight that the bearings cannot ride on the lubricant film instead it squishes it all out you get bearing failure.

Also they way you suggested is how I was taught how to do it, I was then taught at school that this is STILL not correct. I even tried it for myself while setting up a differential in class, setting up the turning torque removing the nut and reinstalling it to the marks i put on the pinion and the nut it further crushed the crush sleeve and my turning torque went way up. the "proper" way to do it (which VERY few people do, at ANY shop) is to remove your wheels, followed by your brake calipers and rotors (due to the ebrake in the hat), then measure your turning torque at the pinion flange (drive shaft removed naturally), then you match this number while going back together.

Considering the noise happened after the pinion seal repair he likely has some dead pinion bearings as already suggested, the likely hood a wheel bearing gave up the ghost right after a repair that can commonly cause this concern is slim-to-none, possible but not probable.
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  #16  
Old 03-02-2012, 08:06 AM
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Re: Rear diff whine.... I think...

I recently changed both diffs fluid and it is still whining. Would you be able to tell if it's the rear wheel bearings by turning the jeep one way or the other? If it'sthe diff bearings then it's hard to tell. It's easy to diagnose the front bearings, but the rear is difficult. I know anything above 35mph the whine goes away, More noticable the when coming to a stop. I just don't want to change out the bearings if it could be the U joints. Where should i stat first bearings or U joints? Noise is for sure coming from the rear diff area. Thanks
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Old 03-04-2012, 06:51 PM
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Re: Rear diff whine.... I think...

If it were the diff, the whining would go decrease if you let off the throttle or go down a hill, and increase when you push it down or go up a hill. If it were a wheel bearing, it would make the noise all the time, regardless of throttle position.
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  #18  
Old 07-12-2012, 01:53 PM
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Re: Rear diff whine.... I think...

I'm the thread starter.... Final Answer is... Pinion bearing is shot..... i'm at 135k now and it started to vibrate really bad as in mirrors vibrating and dashboard creaking when i was at steady speed over 65 or so.... if i was on the gas or off the gas, was smooth... even slightly on the gas was enough to make the vibration go away...

A used rear end is going in as I type... their was pieces of the bearing in the pumpkin... so don't want to do all the work on the bearings only to find out my gears are messed up as well...

will report again after its installed.

Mike
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Old 07-16-2012, 07:14 AM
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Re: Rear diff whine.... I think...

Well I picked it up Saturday morning, who knew the jeep was this quiet ? after a short ride I'm pretty sure the rear end was not 100% from the day i bought it. No more virbrations or whine.
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Old 07-16-2012, 10:12 AM
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Re: Rear diff whine.... I think...

^ sweet!
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