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Awful clunk on uneven right turns

jkimm7

New Member
Mar 18, 2019
6
Rhode Island
This has been driving me nuts, Whenever I take a sharp right turn or turn right on an uphill or downhill, there is an awful clunk that seems to come from the back end. I have recently installed new shocks, new sway bar bushings and sway bar end links and still cannot find where the sound is coming from. I cannot replicate the sound parked or jacked up. Some of the control arm bushings are starting to show some dry rot but are not visibly worn. Would control arm bushings be the cause of this or produce a sound like this? the sound doesn't seem to be metal on metal but a much lower clunk (unfortunately that is as best as I can describe it) I have checked the play in the rear axle c clips and it is within the normal amount of movement. I do have 1.75 inch coil spacers if that might cause some original parts to be maxed out. Any suggestions are appreciated
 
Feb 27, 2016
38
This has been driving me nuts, Whenever I take a sharp right turn or turn right on an uphill or downhill, there is an awful clunk that seems to come from the back end. I have recently installed new shocks, new sway bar bushings and sway bar end links and still cannot find where the sound is coming from. I cannot replicate the sound parked or jacked up. Some of the control arm bushings are starting to show some dry rot but are not visibly worn. Would control arm bushings be the cause of this or produce a sound like this? the sound doesn't seem to be metal on metal but a much lower clunk (unfortunately that is as best as I can describe it) I have checked the play in the rear axle c clips and it is within the normal amount of movement. I do have 1.75 inch coil spacers if that might cause some original parts to be maxed out. Any suggestions are appreciated
I have to ask, have you checked the frame at the control arm mount for rust? Very common on a tj. Track bar bushings?

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TJBob

TJ Enthusiast
Feb 17, 2019
110
South central Indiana
I read on here awhile back, about how it’s good practice to loosen up control arms and re-torque them once in awhile, with the vehicle on the ground. Something to do with coil springs settling over time and binding the bushings on the control arm. Idk if this would cause the arms to pop or clunk, but it could be a good place to start since you have the spacers.

Maybe one of these guys that has a bit more knowledge than I do will chime in for ya.

I had a mysterious clunk I chased for awhile. Turned out to be the rear sway bar end link on the driver side. The upper endlink bolt had worked its way loose. You said you have replaced all of that. May go back and double check torque just to be sure you didn’t miss a bolt.

Good luck!
 

toximus

TJ Addict
Supporting Member
Mar 29, 2018
1,987
Northern WI
Find a diagram online and check that all of your body mount pucks are in place.

Do you have a body lift?
 

Alex01

Enthusiast
Supporting Member
Ride of the Month Winner
Mar 23, 2018
2,072
Martinez, CA, USA
I read on here awhile back, about how it’s good practice to loosen up control arms and re-torque them once in awhile, with the vehicle on the ground. Something to do with coil springs settling over time and binding the bushings on the control arm. Idk if this would cause the arms to pop or clunk, but it could be a good place to start since you have the spacers.

Maybe one of these guys that has a bit more knowledge than I do will chime in for ya.

I had a mysterious clunk I chased for awhile. Turned out to be the rear sway bar end link on the driver side. The upper endlink bolt had worked its way loose. You said you have replaced all of that. May go back and double check torque just to be sure you didn’t miss a bolt.

Good luck!
X2. The first thing I would check it the torque on the control arms. Every so often I hear a clunk in the rear end and so far every time the issue has been that my passenger side lower control arm needs to be re-torqued. In my case I usually hear a clunk if I quickly smash the throttle and let go. (think a bucking bronco).

Can you simulate the noise by pushing the jeep really hard side to side or jumping on the rear bumper?
 
OP
J

jkimm7

New Member
Mar 18, 2019
6
Rhode Island
X2. The first thing I would check it the torque on the control arms. Every so often I hear a clunk in the rear end and so far every time the issue has been that my passenger side lower control arm needs to be re-torqued. In my case I usually hear a clunk if I quickly smash the throttle and let go. (think a bucking bronco).

Can you simulate the noise by pushing the jeep really hard side to side or jumping on the rear bumper?
I will try re torquing the control arms, can't replicate it by jumping on the bumper, I will try side to side soon
 

DaveC

Member
Jan 3, 2019
56
Arizona
I will try re torquing the control arms, can't replicate it by jumping on the bumper, I will try side to side soon
I had the exact same issue. TjBob's comment is right on

I had a mysterious clunk I chased for awhile. Turned out to be the rear sway bar end link on the driver side. The upper endlink bolt had worked its way loose. You said you have replaced all of that. May go back and double check torque just to be sure you didn’t miss a bolt.


....rear sway bar in mine as well.
 

Mike_H

Rust Belt Heavyweight
Supporting Member
Feb 28, 2017
4,279
Grand Rapids, MI, United States
I had a mysterious clunk that I chased for a bit. Couldn't replicate it by jumping on it, shoving it side to side, etc. Only while driving. It turned out to be a control arm bolt. I finally gave up and took it in. The Mechanic hit them all with an impact, and broke the one that was loose. Apparently, it had been stretched and was not holding torque anymore (as I torqued it when I put it in). It was probably right on the edge of breaking when I finished. Just took another check to find it.
 

Shinebox_LJ

New Member
May 11, 2019
6
Los Angeles, CA
Do you have some form of limited slip differential in the rear? Could cause this type of noise with quick turns.
Is that common? I recently took mine to the shop for a mess of noises (bent axle, control arm bracket, and the slip on the rear 44 was no good.) I replaced it with a truetrac but hear that clicking noise on sharp right or quick turns. Sometimes on left as well. They told me at the shop (who only work on Jeeps) that it’s the slip. They checked the slip again and changed the gear oil after 500 miles and said everything looks perfect. Other than the click, it rides like a champ. It wouldn’t get to me as much if I knew that’s what it is lol
 

DetroitTJ

Member
Jan 25, 2019
45
Detroit, MI
Is that common?
I honestly don’t know if it’s common or even a concern. I had read before that a LSD can cause a clunk when taking corners and it just got me thinking I guess. It makes some sense that if the differential locks especially on a vehicle with oversized tires while cornering, that there would be unfavorable stresses across the rear end. Ideally the differential would be open while cornering. When I posted that question I was actually hoping to get some affirmation that this could be the case.

Let’s ask @Rob5589 - he’s very knowledgeable about gearing.