Passenger Rear "Clunk"... Plz help - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 21 Old 04-15-2013, 12:54 PM Thread Starter
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Passenger Rear "Clunk"... Plz help

Well... I've gone throught everything I can think of, and I can't find it. So, I'm going to ask for words of wisdom here.

I have a clunk when I hit bumps in the road. Big and small... even small ones make the noise. It seems to do it on the downtravel.
I see no signs of anything touching or rubbing anywhere in the range of travel with the Jeep on the ground, bouncing on the bumper, or on the lift, raising and lowering the rear-end with a transmission jack. I can't make it duplicate the noise unless I'm driving down the road.

It almost sounds like the wheel is wobbling on the hub, but I KNOW that's not the case or it'd do it all the time, not just when I hit a rough spot in the road. I also went back and removed the little locks off of the rotors and reinstalled my wheels after the shop failed to removed them when they put my aftermarket wheels on.

Things I've checked:
Shocks- The stock ones were all tight and didn't have issues. I replaced them with OME this weekend... clunk still present.
Track bar- Both bolts were tight. Installed Terraflex bracket this weekend... clunk still present.
Sway bar- Links weren't touching anywhere, replaced with 2" longer ones this weekend to compensate for lift... clunk still present.
Bumper- Checked bolts for tightness... clunk still present.
Subwoofer/box- removed and rode around without it in the Jeep... clunk still present.
Brake rotor/caliper clearance- All appears to have plenty of room, and I'm not hearing the noise on the passenger side.
Spring- Its sitting in the factory rubber perch up top, and isn't contacting the body anywhere. I've even rotated it and re-positioned it on the axle to see if it changed anything... clunk still present.
Exhaust- I've gone up under there and pulled/pushed on it and don't feel it rubbing/hitting anything...? The noise doesn't sound like a heat-shield at all. It's more of a clunk, not a tap.

So the problem is in the rear wheel-well area somewhere, but for the life of me, I can't find it.

Thoughts???
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post #2 of 21 Old 04-15-2013, 01:34 PM
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Could it be your bumpstops?

Do you have a lift/what kind/size/etc.? More detail might be able to help.
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post #3 of 21 Old 04-15-2013, 02:04 PM
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Drive shaft against the gas tank skid?
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post #4 of 21 Old 04-15-2013, 03:10 PM
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Check the stock jack that sits in the back...im serious, that thing gets the full effect of each bump and could rattle and clunk. Mine clunks and rattles.

If not, check your control arms

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post #5 of 21 Old 04-15-2013, 03:20 PM
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Check to make sure your rear frame side track bar bolt is not hitting the bumpstop pad

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post #6 of 21 Old 04-15-2013, 03:21 PM
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If you have a lift your driver side rear spring may be hitting your trackbar when you hit a bump if your springs are bowed in the rear

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post #7 of 21 Old 04-15-2013, 06:08 PM Thread Starter
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Well... I'm 90% sure its a bad wheel bearing. when I jacked it up and pulled on the tire in and out it had some movement and something tells me it should not have any. the lug nuts were tight so I took the wheel off as well as the caliper and rotor and the axle actually moved in and out of the housing just a little.
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post #8 of 21 Old 04-15-2013, 06:10 PM
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Quote:
Originally Posted by autenb View Post
Well... I'm 90% sure its a bad wheel bearing. when I jacked it up and pulled on the tire in and out it had some movement and something tells me it should not have any. the lug nuts were tight so I took the wheel off as well as the caliper and rotor and the axle actually moved in and out of the housing just a little.
Did you check torque on the axle retaining nuts?

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post #9 of 21 Old 04-15-2013, 06:13 PM Thread Starter
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Did you check torque on the axle retaining nuts?
The whaaa? Are those the 4 that hold the brake assy to the tube? Yea.. Those are all tight.
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post #10 of 21 Old 04-15-2013, 07:36 PM
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Quote:
Originally Posted by autenb View Post
The whaaa? Are those the 4 that hold the brake assy to the tube? Yea.. Those are all tight.
They are the 4 nuts that should be torqued down to 45ftlbs that hold you axle shaft to your axle housing. There are another 2 bolts that hold your brake caliper on.

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post #11 of 21 Old 04-15-2013, 07:39 PM Thread Starter
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Yes. All 6 were very tight. And i retightened the caliper bolts when i was finished
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post #12 of 21 Old 04-15-2013, 07:42 PM
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Have you checked your upper and lower shock mount bolts?

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post #13 of 21 Old 04-15-2013, 07:43 PM Thread Starter
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Checked those first.
I think its the bearings or something.
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post #14 of 21 Old 04-15-2013, 07:45 PM
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Quote:
Originally Posted by autenb View Post
Checked those first.
I think its the bearings or something.
Yea that's a start and they are easy enough to change with a press.

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post #15 of 21 Old 04-15-2013, 07:47 PM Thread Starter
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Its under warranty and service contract. I got it close. The dealership can fix the actual problem.
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post #16 of 21 Old 04-15-2013, 07:47 PM
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Electrical tape on the door striker? Does it go away when doorless?

A lot of good info so far.


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post #17 of 21 Old 04-15-2013, 07:48 PM Thread Starter
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It is not the doors. Any of them. It is very clearly coming from the passenger wheelwell
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post #18 of 21 Old 04-27-2013, 06:30 AM
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I'm having the exact same issue. I can not find a cause. I don't think the bearings would make that sharp clunk. Plus you hear that bearing grumbling long before it clunks.

I had about 500 lbs of lawn care crap in the back the other day. Guess what - no clunk. It's definitely in the suspension somewhere. But I'll be damned if I can find it.

Curious to see what you find.
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post #19 of 21 Old 04-27-2013, 10:12 AM
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Rear coils unseating and contacting rear track bar maybe?

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post #20 of 21 Old 05-10-2013, 09:13 AM Thread Starter
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Quote:
Originally Posted by rdlynch2 View Post
Rear coils unseating and contacting rear track bar maybe?
Well guys, after several weeks of having it in and out of the dealership, checking body mount bolts, bushings, and every piece of hardware back there, removing the fender liners... they can't find it.

And as far as the coils coming unseated... I'm going to use a conduit clamp at the top and see if I can't lock it into position.
Or... maybe replace the top rubber piece. -RC doesn't make another rubber isolator. Even their spacer lifts reuse the factory isolator.

Last edited by autenb; 05-10-2013 at 09:27 AM.
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post #21 of 21 Old 05-10-2013, 09:32 AM
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Quote:
Originally Posted by chknkatsu View Post
Check the stock jack that sits in the back...im serious, that thing gets the full effect of each bump and could rattle and clunk. Mine clunks and rattles.

If not, check your control arms
^^^
This drove me crazy for two days before I figured out what it was
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