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Old 05-17-2008, 11:45 AM   #1
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squealing from up front

Hey everyone, I tried to search for this and had trouble finding a definite answer so I decided to make a new thread.

My jeep has a loud, high pitched squealing coming from underneath the front. It sounds like several angry birds. I have new hubs up front, so I know it's not that, but here is what I've figured out so far:

It's correlated with speed
it's independent of braking
it gets louder when I turn left
it makes noise in both 2 and 4wd
it isn't a belt squealing, although it sounds very similar

It used to only make noise when it was cold out, but it's recently taken to making the noise all the time. I've been turning my radio up to ignore it, but I have to take it on a trip from Colorado to Maryland in a few weeks, and would like to get this sorted out. Any help would be greatly appreciated!

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Old 05-17-2008, 12:59 PM   #2
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Check that the sheet metal rotor guard isn't bent and rubbing on the rotor.

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Old 05-17-2008, 01:08 PM   #3
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or maybe the brakes...most brake pads now have a metal tab to tell you when you should change your brakes. it is part of the pad and will scratch against the rotor.
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Old 05-17-2008, 02:42 PM   #4
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or maybe the brakes...most brake pads now have a metal tab to tell you when you should change your brakes. it is part of the pad and will scratch against the rotor.
Yep I concur - youve worn your brakes down to the 'squeelers'
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Old 05-17-2008, 03:57 PM   #5
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Yep I concur - youve worn your brakes down to the 'squeelers'
I agree, thats usually the problem, either that or stop tying your mother in law to the front bumper...
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Old 05-17-2008, 04:39 PM   #6
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thanks everybody, I'll pick up some pads and get underneath it tomorrow. I'll let you know how everything goes!
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Old 05-17-2008, 04:47 PM   #7
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you can pull the wheel off first and check the pads to see if that is what it is..before you buy something you dont need.

If it is the brakes make sure you get the rotors turn when replacing your pads!!!
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Old 05-17-2008, 06:43 PM   #8
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thanks everybody, I'll pick up some pads
You've already verified the rotor brake shield is straight and not making that noise? I've had two over the past 12 years since buying my TJ and both times I initially thought it was a bearing or my brake pads.
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Old 05-17-2008, 07:07 PM   #9
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OK but what about this. I had the same loud squeeling, and it was the engine. It was a leak in the intake manifold. It was the result of a destroyed CAT. The CAT had dumped catalytic material into the exhaust and blocked it. This created so much back pressure that it blew the manifold gasket. Which resulted in a high pitch squeel like the one you are describing. Just my 2C. Let us know what you find out. Usually brakes are pretty obvious.
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Old 05-18-2008, 09:05 AM   #10
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You've already verified the rotor brake shield is straight and not making that noise? I've had two over the past 12 years since buying my TJ and both times I initially thought it was a bearing or my brake pads.
P.S. That your squeal is independent of braking, that just makes me think more it's not pads and perhaps something like the bent brake rotor shield I suggested earlier.
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Old 05-18-2008, 09:18 AM   #11
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P.S. That your squeal is independent of braking, that just makes me think more it's not pads and perhaps something like the bent brake rotor shield I suggested earlier.
Jerry is right bud. ...as I and he suggested earlier...check the stuff out before you buy stuff you dont need 'ie' brake pads. They mite not be your problem. The rotor shields are flimsy and tend to bend. Also who installed the hub units?? was the left one "side your getting your squeel from" installed correctly all bearings/seals placed correctly and seated properly?

easy way to tell if it is the brake pads....take the brake pads off the front and tie the calipers up to the frame..take it for a drive down the road..SAFELY not a busy road!!! .you will still have rear brakes and your ebrake if needed. Drive slow and leave adiquite time to come to a stop. it the squeel is still there it is not the brakes

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Old 05-18-2008, 12:32 PM   #12
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okay, so before i went out to buy anything i did some inspecting to try and see if i needed pads, if the rotor shield was rubbing, or anything else. And here is what I found: my pads are fine, the rotor shield isn't rubbing, but what is making the noise is the front driveshaft, where it connects to the differential in the rear. I sprayed some wd-40 on where i heard the noise, and am waiting to see if it soaks in and stops it. Has anyone else had this happen?
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Old 05-18-2008, 12:35 PM   #13
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but what is making the noise is the front driveshaft, where it connects to the differential in the rear.
do you mean where the front drive shaft connects to the transfer case? Or the rear differential?
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Old 05-18-2008, 06:09 PM   #14
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sorry, i meant the transfer case...as my name implies I'm mostly a car guy hence not used to transfer cases

but my gearhead roommate told me that most likely it is the yolk, and that there is a zerk fitting which I can use to grease it up. Right now I'm working on getting the skidplate off so I can reach it, I'll let you all know how it goes. Thanks for all the input so far!
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Old 05-18-2008, 06:13 PM   #15
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just so you know the transmission and t-case sits on the "skid plate" if you remove it the tranny and t'case will drop with it ...be carefull
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Old 05-18-2008, 06:38 PM   #16
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but my gearhead roommate told me that most likely it is the yolk
Yolk? Your Jeep has a yolk in it? I'll take two eggs over-easy. (it's "yoke", not yolk )
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Old 05-18-2008, 07:38 PM   #17
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Yolk? Your Jeep has a yolk in it? I'll take two eggs over-easy. (it's "yoke", not yolk )
jerry made a funny....it's history
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Old 05-18-2008, 11:47 PM   #18
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hahaha got me there. thanks for the heads up on the skid plate...is there any way around getting to the yoke w/o taking it off? I'd rather not drop the tranny.
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Old 05-19-2008, 01:07 AM   #19
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I have the same noise. sounds like a bird, but its only at around 5mph regardless of braking.
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Old 05-19-2008, 02:06 AM   #20
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I would say it is a dried up universal joint.If they are factory and do not have a grease fitting the cups will dry out and start squeaking but by that time the u-joint is junk.If your shaft/u-joints are factory they probably don't have zerks in them except for the splines were the shaft moves in and out for suspension travel.To make it short I would say if your drive shaft is squeaking replace the u-joints.
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Old 05-19-2008, 10:11 PM   #21
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so basically what you're saying is i need to change the u-joint? alright, I'll look into that. I feel better now that I at least know what it is though, so thanks everyone. Oh and tobycat1, the noise gets worse...thats how mine started.
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Old 05-19-2008, 10:28 PM   #22
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There a plyable seal were the drive shaft enters the transfer case, If the seal starts to dry you will get a chirping sound. I have the same problem on my jeep. The bandaid is reach up with a can of lube and spray the seal. I do it once a month or so.
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Old 05-21-2008, 11:35 AM   #23
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that actually helped quite a bit, thanks!

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