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Unread 04-05-2011, 10:01 PM   #1
Mitcho11
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2002 TJ Wrangler 
 
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Loud "clicking" noise coming from the rear end

Ok, I am in need of some help identifying a noise I just began to hear in my 02 TJ.

While accelerating I dont seem to hear the noise like I do while slowing down in gear and the best way I can describe the noise is a rapidly repeating click noise.

I was told by a tranmission shop that my transmission needed to be rebuilt but with only 75K miles I find that hard to believe. I think the sound is coming from either the rear drive shaft or differential.

So far I have only pulled the plug on the rear differential to check out the gear oil only to find it to be a milky consistency. I pumped that out and replaced to see if that would solve the problem. It did not which makes me believe I may have been to late. I have noticed minor oil on the differential prior to this. I tightened down all the bolts and planned on replacing the gasket as well but have yet to do so and have taken it through some water in the mean time which I believe is the cause of this issue.

Can anyone offer me any advice or thoughts on this? Could the rear differential need rebuilt, could it be a rear pinion bearing?

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Unread 04-05-2011, 10:05 PM   #2
freeskier93
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Pull the diff cover to properly change the fluid. This will allow you to see the the gears. Check the ring gears, spider gears, and pinions gear for missing teeth.
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Unread 04-05-2011, 10:15 PM   #3
Mitcho11
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Are any of those gears and/or bearings easily replaceable or should I have it professionally done?

I have read about pinion bearing replacement and that seems like a job for a shop to handle due to measurments and adjustments involved.
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Unread 04-05-2011, 10:36 PM   #4
freeskier93
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Quote:
Originally Posted by Mitcho11 View Post
Are any of those gears and/or bearings easily replaceable or should I have it professionally done?

I have read about pinion bearing replacement and that seems like a job for a shop to handle due to measurments and adjustments involved.
Spider gears are easy to replace, ring gear and pinion gear aren't and should be done by a professional.

But start by pulling the cover to look for anything abnormal/broken/out of place.
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Unread 04-05-2011, 11:06 PM   #5
CherokeeGT
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before you start thinking too big get under your jeep and check your u-joints
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Unread 04-06-2011, 05:52 AM   #6
Gruneun
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Quote:
Originally Posted by cherokeegt
before you start thinking too big get under your jeep and check your u-joints
+1
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Unread 04-06-2011, 07:44 AM   #7
93civic_Sedan
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I had something similar, when coming to a stop it was a "click, click, click", and the slower I went the more separated the clicks were.

I have drums in the rear and turns out all of the grease was missing from the grease points on the backing plate. Need to possibly check that. Should be pretty easy, or cheap if you take it somewhere.

Might not be your answer, but it fixed mine. Thought I would try to help. Best of luck!
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Unread 04-06-2011, 01:47 PM   #8
ROUGHSHOD
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Also....make sure you don't have something stuck in one of your tires.

Does the click rate change according to your speed?
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Unread 04-06-2011, 05:14 PM   #9
MICOMARK
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Ah Cherokee GT and all who have replied: Mitch011 is my son and let me explain a bit more about what we did to figure out where this noise might be located. First, I shook the drive shaft at the rear u-joint just forward of the rear differential. It seems solid with very little to no play. We have the jeep up on four jacks and went through all the gears. 1st gear, couldn't hear the noise, 2nd gear started to hear it, 3rd and 4th gear really heard it. It is not a whir or whistle like you would hear from a clutch throw out bearing. More of a click or clunk as the drive shaft turns. Took the greater RPM's for the noise to really produce itself. So, while drivetrain was turning I put a 1/2" solid brass rod to the bottom of the differential case and cupped the other end to my ear. The noise seemed louder toward the yoke shaft portion of the diff case than when I moved the rod back more toward the center of the bottom side of diff. case. So, not sure if it is differential or pinion gears, the pinion bearing or the U-joint?
I was thinking of taking out the rear drive shaft, then driving it in Front drive only. If the sound does not produce itself when on the road and going through the gears, then it isn't in the diff. gear box but could still be rear pinion bearing or the u-joint. Am I thinking right here?? Any other testing ideas anyone.
We kind of ruled out the transmission even though told it may need bearings because when we put the transfer case in neutral and went through the gears no noise. I agree with my son. AT 73K miles trans. bearings shouldn't be bad
Thanks and thanks.
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Unread 04-06-2011, 05:28 PM   #10
wj0313
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Sounds like you are on the right track. I would disconnect the shaft and check for noise. I know its painful to think the trans may be the cause but don't rule it out. The easiest way to rule out the diff is to just pull the cover.
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Unread 04-06-2011, 05:49 PM   #11
bwright1818
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You may think this is stupid but a true story....I had an alloy wheel come loose and this is EXACTLY what it sounded like and I mean exactly, at least by your description. Wouldn't hurt to rule it out quick, anyway....
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Unread 04-06-2011, 11:58 PM   #12
CherokeeGT
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if the sounds coming from the rear diff pull the cover and see if theres anything unusual in there (broken ring gear or anything like that

also theres sooo many distinct sounds one can hear from a car if you could get a video of the sound i might have heard it before (worth a try)
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