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Old 01-20-2014, 11:43 PM   #1
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mystery noise in my 03 rubicon

I have an 03 rubicon with 108,000 miles. 4" procomp lift and goodyear mtr tires. Other than the lift, it's stock with an automatic. I picked up a strange noise about a week ago and I'm stumped as to where its coming from and am hoping the forum can help me out.
At first I thought it was the sepentine belt tensioner, which was worn, but after replacing it, the noise remained. A friend rode with me and we thought we traced to the rear end, driver side. I pulled the axle shaft and replaced the bearing, and the noise remains the same.
I have checked all four wheels for bad bearings, and they feel solid. Ujoints check out ok too. there is no vibration or shaking at any speed, just a noise.
The noise speeds up and slows down to match RPMs, and goes from a hiss to a low rumble as I slow down. I'll try to record it and post later. Any help is appreciated.
Thanks,
Mark

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Old 01-20-2014, 11:48 PM   #2
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Ck u-joints real good. Take out the rear drive shaft an use 4x4 to pull the jeep, see if the noise changes, or goes away. At least it'll isolate front from rear. Does engaging the t-case make any change? Can u suspend the vehicles 4 ties off the ground and listen to it?

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Old 01-21-2014, 12:10 AM   #3
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I plan on pulling the rear drive shaft tommorow after work, I'll post what I find.
Thanks
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Old 01-21-2014, 06:49 PM   #4
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I pulled the rear driveshaft after work. the u joints seem to move freely but the Caps were rusty and a couple of the seals were split. There was grease in all the caps though. I engaged 4 wheel high and took a few laps around the neighborhood and got up to speed about 40 miles an hour. The noise that I was hearing last night was greatly reduced. Does this indicate bad u joints or drive shaft? Or just a symptom of a transmission problem? I'm going to replace the u joints and have to drive shaft checked out and see what happens tomorrow.
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Old 01-21-2014, 06:53 PM   #5
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Quote:
Originally Posted by mark45acp View Post
I pulled the rear driveshaft after work. the u joints seem to move freely but the Caps were rusty and a couple of the seals were split. There was grease in all the caps though. I engaged 4 wheel high and took a few laps around the neighborhood and got up to speed about 40 miles an hour. The noise that I was hearing last night was greatly reduced. Does this indicate bad u joints or drive shaft? Or just a symptom of a transmission problem? I'm going to replace the u joints and have to drive shaft checked out and see what happens tomorrow.
Were the needle bearings in the cap or just grease? I'll post a pic in a sec of a new one.
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Old 01-21-2014, 07:10 PM   #6
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Yes. The needle bearings looked to be in place. I checked the needle bearings on the rear u joint only at this time
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Old 01-22-2014, 08:52 AM   #7
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Quote:
Originally Posted by mark45acp View Post
I pulled the rear driveshaft after work. the u joints seem to move freely but the Caps were rusty and a couple of the seals were split. There was grease in all the caps though. I engaged 4 wheel high and took a few laps around the neighborhood and got up to speed about 40 miles an hour. The noise that I was hearing last night was greatly reduced. Does this indicate bad u joints or drive shaft? Or just a symptom of a transmission problem? I'm going to replace the u joints and have to drive shaft checked out and see what happens tomorrow.
how could noise be reduced when you didn't change nothing
or am I missing something
yer 4" lift could be maxing out yer rear ds causing stress
im assuming you went with a double cardian shaft since you don't have a slip yoke
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Old 01-22-2014, 12:31 PM   #8
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how could noise be reduced when you didn't change nothing
or am I missing something
yer 4" lift could be maxing out yer rear ds causing stress
im assuming you went with a double cardian shaft since you don't have a slip yoke



I took out the rear shaft and drove it in front wheel drive to see if the rear shaft was the problem.
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Old 01-22-2014, 08:17 PM   #9
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I puled the front driveshaft,hoping to isolate the noise, but it did not. I decided to juack up the front end and spin the wheels and see if I could detect a bad ujoint or bearing. When I would spin the wheels free hand, they seemed to drag as if the brakes were sticking, especially the passenger side. I shot a short video,
so give it a listen and let me know what you think.

thanks for all of the input
Mark
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Old 01-22-2014, 08:30 PM   #10
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Cannot tell but if you remove wheel then remove caliper and hang it by a piece of wire to keep it from hanging by brake line and then replace wheel and spin any noise or drag will not be brake as caliper is off

Could do both sides and rule out or rule in drag or sound coming from brake
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Old 01-22-2014, 08:38 PM   #11
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I'll give that a try. Thanks for your reply
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Old 01-23-2014, 11:01 PM   #12
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Ok. Got it sorted out. Turns out it was the right front caliper was sticking. I replaced the caliper and the rubber brake line and it's good to go. I think hubs and axle u joints are in the near future.
Thanks for all of the input from everyone. I hope I can return the favor someday.

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