98 ZJ Humming Noise From Front. Please Help! - Page 2 - JeepForum.com
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post #16 of 21 Old 06-27-2016, 01:30 PM
paulsheer2
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You have to take the front wheels off and check for play on everything.

Disconnect the steering knuckle from the steering linkage and check that the knuckle has no play (do this with the wheel off) and that the bearing has no play and is smooth and is not leaking grease. It's too difficult to tell with everything connected and the wheels on. CV's also.

Then check your control arm bushings and EVERY articulating suspension part for play

You are sure to find lot's of problems. You have to fix all of them to get a perfect ride.

CVs too can make a noise when there is no grease.


93 ZJ 5.2, 3.58 stroked. 242 swap. 2.5" lift. dozens of mods.
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post #17 of 21 Old 06-27-2016, 09:20 PM Thread Starter
JaredD33
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Quote:
Originally Posted by Uniblurb View Post
It's still beyond me how a "so called shop" could even align it with bent or broken parts?? Did you ask them to inspect if for damage and mention running into a ditch at 25-30mph?
Yeah, they were the first shop I went to after. They wanted 3500 to replace the whole differential. The second shop wanted 2500 to rebuild it. Neither said anything about the steering parts.
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post #18 of 21 Old 06-27-2016, 09:44 PM
Uniblurb
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Quote:
Originally Posted by JaredD33 View Post
Yeah, they were the first shop I went to after. They wanted 3500 to replace the whole differential. The second shop wanted 2500 to rebuild it. Neither said anything about the steering parts.
Geeze, at those prices you might as well buy one or two more ZJ's!

You may want to check your steering box wasn't jarred loose from the frame. Some good advice from paulsheer too.

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 96 4.0 XJ (son's)


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post #19 of 21 Old 06-27-2016, 10:33 PM
paulsheer2
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you will need this tool as a start --

http://www.harborfreight.com/automot...tor-99849.html

93 ZJ 5.2, 3.58 stroked. 242 swap. 2.5" lift. dozens of mods.
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post #20 of 21 Old 06-28-2016, 07:04 AM
BorderWalker
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Not to hijack from Jared, but just wanted to add that my own ZJ makes a very similar sound. At speeds above 30mph, there's a noticeable hum/whine from the front, but only when I let off the gas. Increases in frequency at higher speeds, but again, only when I let off the gas pedal.

I've never noticed anything bad to come of it, but it is one of those noises I've been trying to chase down with no luck. So, your not alone Jared.

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post #21 of 21 Old 06-30-2016, 10:20 AM
TIPPEDITOVER
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Not to shock anyone, but a hum/whine that changes in tone as you lightly accel/decel and generally gets louder the faster you go is often loose carrier bearing preload. Easiest way to determine, pull axles, pull the cover, pull the carrier retaining caps and see if the carrier practically falls out. I bet it's loose in there.

This condition is not ok if it's present. Seen it plenty of times. Often a result of someone thinking they know what they are doing rebuilding a diff and not setting enough carrier bearing preload.

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