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Old December 15th, 2009, 11:22 AM   #1
Blue XJ
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Default 8.25 Axle Whine

I had my rear axle rebuilt a couple years ago, I had a pinion bearing go out and the pinion ate the ring gear, so the gears and bearings were all replaced. About 3500 miles later and the rear end is really howling again. I have popped the cover and looked at the gears, they don't appear to have any real wear on them, and the bearings all seemed tight.

They whine whenever my foot is on the gas pedal, and they really whine once I get over 40mph or so. While I'm coasting, they are perfectly quite.

Is this the beginning to eating another ring gear? Or was it just a bad setup originally and they are just loud? IIRC they are Yukon gears, 4.56's.
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Old December 15th, 2009, 11:24 AM   #2
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Were the spiders replaced at the same time?
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Old December 15th, 2009, 11:24 AM   #3
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you've had nothing but trouble with that axle (wasnt the previous owners fault ). time do switch to something else, D44, 8.8, 9"
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Old December 15th, 2009, 11:35 AM   #4
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sounds like backlash isn't set properly
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Old December 15th, 2009, 11:40 AM   #5
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No spiders in it, its got a Powertrax No-Slip lunch box. The only thing I have done with the axle since I had it rebuilt was replace all the springs in the locker, put a set of alloys in it, and change the fluid.
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Old December 15th, 2009, 11:41 AM   #6
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I agree its time to upgrade, too bad I can afford to do the rear, but wouldn't be able to build a front.
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Old December 15th, 2009, 11:43 AM   #7
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i dont think its time for 1-ton but maybe time to try another similar rated axle
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Old December 15th, 2009, 11:47 AM   #8
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Quote:
Originally Posted by jeepnxj96 View Post
sounds like backlash isn't set properly

Is there an easy way to check it? I have a dial indicator and magnetic base, I just have no idea on what to do when it comes to gears.
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Old December 15th, 2009, 06:19 PM   #9
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Quote:
Originally Posted by Blue XJ View Post
They whine whenever my foot is on the gas pedal, and they really whine once I get over 40mph or so. While I'm coasting, they are perfectly quite.
Typically, gear whine is most noticeable about 45MPH. With noise on acceleration, it could be pinion or diff bearings or preload issues. I suspect that you'll find a bearing issue, which is resulting in a new contact pattern on the gear teeth, which is also resulting in gear noise.

Lucky for you, I know a guy who can fix it
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Old December 15th, 2009, 10:10 PM   #10
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Hmm, I may have to give that person a call when I am off of work in a couple weeks. I'm hoping it just needs to be reset, since there is only 4k miles on the bearings/gears. Can you have 'your guy' shoot me a ballpark on new bearings and gear setup?
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Old December 16th, 2009, 05:28 PM   #11
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Originally Posted by Blue XJ View Post
Hmm, I may have to give that person a call when I am off of work in a couple weeks. I'm hoping it just needs to be reset, since there is only 4k miles on the bearings/gears. Can you have 'your guy' shoot me a ballpark on new bearings and gear setup?
I would, but depending on the wear of the gear you can scallop the teeth if you reset the pattern, which just results in the gear falling apart.....

You'd be looking about $525 installed with everything new.

Last edited by Jeeperz Creeperz; December 16th, 2009 at 05:31 PM.
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