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Old 04-22-2014, 10:34 AM   #1
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2013 JKU suspension problem

I have a 2013 JKU. I have been experiencing a thud/clunk over bumps which seems to be coming from my driver side front area. The suspension is all oem, though not what the jeep was born with. The shocks are take offs from a similarly equipped JKU. I also have some take off sway bar end links I installed after finding a mounting post on my jks quicker disconnects kept coming loose.



I read somewhere that bum shocks can cause this sort of thud/clunk but before I drop the money on a new set I wanted to reach out for some advice.



I described the same thing to a Stealership yesterday and they said everything is fine. I disagree, mainly because why would the driver side thud and not the passenger side?



Thanks in advance. I tried to be as detailed as possible but it's early. Feel free to ask further questions.




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Old 04-22-2014, 10:42 AM   #2
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I have found that after I installed my Swaybar disconnects they became loose after about 500 miles and would clunk on one side or the other going over bumps. I would check the mounting points of each front shock as well as the sway bar end links.

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Old 04-22-2014, 11:20 AM   #3
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^ X2. If you haven't touched the track bar, the sway bar links are the obvious starting point followed by the shocks.

It's too soon for your ball joint to wear out unless you have driven it hard and off road frequently.
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Old 04-22-2014, 11:37 AM   #4
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Also check the Front upper control arm bolts where they bolt to the frame. Mine come loose all the time.....very annoying and will cause a clunk. Hit the brakes hard and come to a stop....then accelerate...does it clunk? Or on a sharp low speed turn...ie driveway...clunk? Mine is the upper control arms everytime. Need to make a 1/2 to 3/4 turn to tighten back up and all is good. I really need to use lock nuts to end the constant maintenance.
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Old 04-23-2014, 10:24 AM   #5
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2013 JKU 12,000 miles and stock suspension. I just had to tighten the sway bar links on the drivers side for the reason you just described. Its pretty easy with a couple of wrenches.
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Old 04-23-2014, 10:40 AM   #6
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Yup, end links all the way. Common problem on all cars really.
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Old 04-23-2014, 11:27 AM   #7
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As said, shock bolts too. I had an upper work loose and make the same sound.
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Old 04-23-2014, 11:29 AM   #8
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Had the same problem, it end up being one of the front sway bar links was not all the way tight.
So I would double check both of those.
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Old 04-23-2014, 12:19 PM   #9
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I actually just installed stock sway bar end links after removing JKS quicker disconnects. I marked the bolts after torquing and they haven't moved. I have also double checked the torque to confirm. problem persisted before and after the end links were replaced... I appreciate the suggestion but I feel they have been ruled out as the culprit.

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Old 04-23-2014, 12:22 PM   #10
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I have checked all bolts in the suspension and all are tight. I ordered a full set of bilstein shocks (4600's). Further investigation revealed all the symptoms are symptoms of a bad shock. the current shocks were Rubicon take-off, though the seller claimed they only had a few hundred miles on them, who really knows their prior history. I know since I owned them they went from lifted application (leveling kit) back to stock ride height.

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Old 04-23-2014, 12:23 PM   #11
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again, I appreciate everyone's suggestions. All the forums really helped me in my quest.

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Old 04-23-2014, 12:23 PM   #12
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Did you check the torque on all the suspension parts? I had a clunk & it was my drivers lca.

Oops, you posted the same time as me!
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Old 04-23-2014, 01:33 PM   #13
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Probably the sway bar links; mine did that when I got my 2013. Rock the body really hard and see if you can recreate the noise. Mine was the top bolt that was loose. Then just tighten with a wrench.
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Old 05-10-2014, 07:00 PM   #14
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Old 05-15-2014, 04:25 PM   #15
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It was the drag link. It has been replaced. Case Closed.


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Old 08-29-2014, 08:24 PM   #16
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The new drag link cured most of the problems. However I do still hear a thud, usually from drivers side, over medium sized bumps/road imperfections. The handling of my jeep seems ok, but this "thud" which I can describe on a metal on metal thud is really annoying. Not due for an oil change/service for a few thousand miles but what should I have them look at when I get back to the shop? Ball joints? I have crawled under numerous times and tried to find something loose to no avail. I'm going to try to jack it up and test the ball joints....
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Old 08-31-2014, 08:21 AM   #17
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Decided to crawl under and check torque/tightness and found this:

http://youtu.be/VK-tYvJPaZ0

Is that amount of up/down movement ok, or is it worn (again)?
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Old 08-31-2014, 09:19 AM   #18
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same issue here, play in steering and it was replaced by the dealer under warranty, I just noticed slight play at the drag link/pitman area that I will ask the dealer to change/fix

no play should be there as far as I know.

here is the replacement part.
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Old 08-31-2014, 09:29 AM   #19
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Quote:
Originally Posted by RenegadeUL13 View Post
Decided to crawl under and check torque/tightness and found this: http://youtu.be/VK-tYvJPaZ0 Is that amount of up/down movement ok, or is it worn (again)?
Just that joint ? I was reading somewhere that the stock Tre's have a spring that that small amount of play using channel locks is normal.
If it pops up and down doing the steering test, it's worn.
Trying to find the post now. I don't have stock steering anymore.
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Old 08-31-2014, 09:53 AM   #20
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Quote:
Originally Posted by kjeeper10 View Post
Just that joint ? I was reading somewhere that the stock Tre's have a spring that that small amount of play using channel locks is normal. If it pops up and down doing the steering test, it's worn. Trying to find the post now. I don't have stock steering anymore.
Yeah the Pitman arm end of the drag link has no play....

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