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Thread: 98 ZJ Humming Noise From Front. Please Help! Reply to Thread
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  Topic Review (Newest First)
06-30-2016 11:20 AM
TIPPEDITOVER 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.
06-28-2016 08:04 AM
BorderWalker 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.
06-27-2016 11:33 PM
paulsheer2 you will need this tool as a start --

http://www.harborfreight.com/automot...tor-99849.html
06-27-2016 10:44 PM
Uniblurb
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.
06-27-2016 10:20 PM
JaredD33
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.
06-27-2016 02:30 PM
paulsheer2 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.
06-27-2016 11:03 AM
Uniblurb 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?
06-27-2016 07:36 AM
LowBudgetZJ Yeah you probably bent something, maybe even an axle tube.

FYI, it's not always in 4wd unless your viscous coupler is toast. When you lose traction 4wd kicks in with a properly functioning viscous coupler.
06-26-2016 11:45 PM
JaredD33 I hit pretty hard. Probably going at least 25-30 MPH. My right front wheel took the hit. The steering was jacked after that. The differential problem happened a few days later.
06-26-2016 04:04 PM
98318242 How hard did you hit the ditch? I wonder if you possiblye bent or tweaked the front diff.

Sent from my VS980 4G using Tapatalk
06-25-2016 11:39 AM
Uniblurb ^ agree with MrR and you have 2 separate problems while you best get your steering fixed first!

That must have been a "fly-by-night" or "speedy" alignment shop to do an alignment when you have some bent or broken steering related parts. Most good ones even help diagnose the problems while saying bring it back for an alignment after you get those problems fixed or give you an estimate on them doing the repairs.

It's probably best to have a helper turn the steering wheel back/forth while you're under the front looking for loose, sloppy, or broken parts. Who knows what's bad under there after running it into a ditch.

Your differential is a whole different ball-game while some real good info by Kg in that link for setting up a differential right.
06-24-2016 09:43 PM
MrRoundel I agree with the idea of fixing the steering issue first. That stuff can kill you, and perhaps others. If it feels like you're driving on ice when you're not driving on ice, that's a problem. Conversely, in most worst case scenarios, the differential noise should only leave you stranded and in need of a tow. Good luck.
06-24-2016 09:04 PM
JaredD33 I'll try pulling the front shaft. I think it's dumb as hell how its 4 wheel all the time anyways. Do you think my steering issue is something totally unrelated? The front end alignment didn't help anything at all.
06-24-2016 04:30 PM
DaNgER13 Duplicate
06-24-2016 04:28 PM
DaNgER13
Quote:
Originally Posted by PolkaPower View Post
It's a 98 so no it does not hurt the VC. Only 93-95 does that matter. Basic information.
I caught myself after I posted.

You Win. You get a free cookie
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