Clunk in front end over slight bumbs what is it? -
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post #1 of 12 Old 09-04-2011, 07:19 AM Thread Starter
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1995 YJ Wrangler 
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Location: Longwood
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Clunk in front end over slight bumbs what is it?

Second annoying issue on new YJ is a clunking noise in front end when going slow speed. Most noticeable when wheel is turned and exiting my driveway onto road where there is a bump. It doesn't happen every time but at a certain angle and speed it makes a loud noise like I am driving a pos. I get it that noises are part of owning a jeep...but, as a new owner I am just trying to figure out what I have on my hands in it's present condition! Nothing appears loose or untight down below. I greased what I could on the front end and I will be doing a full service shortly. Just thought I would try to use some of your brains to help pinpoint things to specifically check when I get it jacked up. I assume this may be a bushing, u joint, or similar issue and with this post I know you can't be sure but any insight on what I should look for first would be great. Thanks in advance I sell insurance for a living so kind of, no, rather a total toolbag here when it comes to mechanical wherewithal.

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post #2 of 12 Old 09-04-2011, 08:01 AM
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1989 YJ Wrangler 
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check the trans mount.

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
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post #3 of 12 Old 09-04-2011, 08:04 AM
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1993 YJ Wrangler 
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I had the same issue, well maybe still have, i don't know yet. I checked everything i could think of and nothing jumped out at me except my sway bar links, and a couple of my spring bushings didn't look so hot. Also two body mounts were bad. I purchased a complete bushing kit from quadratech, bodymounts, all track and sway bar bushings ( yeah i still got em,) spring bushings. Also changing the shocks sooo hopefully in doing this i might have cured it. In the process of changing these i decided to clean up the frame so it hasn't been on the road for a while. Mine was a definite clunk only at slow speeds and with a slight bump w/the wheels turned slightly. Some will say u-joints but mine seem fine. Maybe take a piece off at a time and see if it goes away to pinpoint it. Good luck.

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post #4 of 12 Old 09-04-2011, 09:03 AM Thread Starter
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Thanks fellas
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post #5 of 12 Old 09-04-2011, 09:35 AM
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Do you still have the trac bar installed? If so, then remove it and move it to the nearest dumpster, then try driving it again to see if the banging is still there. Nothing lost in this venture, as the trac bars on a YJ are about as useful as boobies on a bull
I would say trac bar bushings from your description, but could be other bushings/tie rod ends/etc too

1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.
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post #6 of 12 Old 09-04-2011, 11:39 AM
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My first thought was also front trac bar. If not then I'd check ball joints and tie rods.

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post #7 of 12 Old 09-04-2011, 04:00 PM
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Trac bar.. mine does the same thing. i just ignore it. i didnt want to remove it cause it helps with steering and also from breaking shackles.
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post #8 of 12 Old 09-04-2011, 08:02 PM
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1995 YJ Wrangler 
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Mine does the same thing except it doesn't really seem to matter what speed I am going or where I have my wheels pointed. Over the past few months I have replaced: steering box, draglink, tie rod, all tierod ends, all four balljoints, shocks, wheel bearings, both motor mounts, tranny mount and torque arm, brake calipers, pads, and rotors. Pretty much rebuilt the entire front end of my Jeep and then some. I didn't do all of this because of the noise but I figured one of those things listed would take care of it. Also I don't have a sway bar or track bars, I use those to keep the tarp from blowing off of my stingray project lol. It almost sounds like someone is picking the motor up about 3 to 4 inches and dropping it. The only thing I can think of is the springs/shackles because they are the only thing that I haven't replaced. I have noticed that my spring packs shift around quite a bit after taking the track bars off. The drivers side military wrap is touching the mount on the frame and I can hear them cracking and popping when I am wheeling it. I am about to do a springover and will be replacing the springs and shackles (3.5" bds springs and 1" shackles) with stock length boomerangs and RE 1.5" springover springs. So we'll see if the clunk will go away.
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post #9 of 12 Old 09-04-2011, 08:42 PM
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Alright, and allow me to apologize in advance for this stupid question.

Have you checked your motor mounts yet?

Other than that, with all you have done, I am at a loss. Other than checking all U Joints including the most important, the ones at your front steering near the wheels. 6 total U Joints.
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post #10 of 12 Old 09-05-2011, 04:23 AM
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Dead cat
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post #11 of 12 Old 09-05-2011, 09:39 AM
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1989 YJ Wrangler 
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Okay, this is embarrasing but in the spirit of sharing to help...

Had this thunk once in a while when going over a bump. Drove me crazy. I checked everything I could get my hands on but couldn't find it. One day I pop the hood and notice the battery on its side. Acid and spilled out and done wonders for the 4wd vacuum tubes. The thunking was Jo-Jo telling me the stinkin' battery strap had come off and the ol' 12 volter was bouncing around like a pogo stick.

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post #12 of 12 Old 09-05-2011, 01:31 PM
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i had the same thing in jeep , for me it was the front center bolt on my bodylift . theres only one mount in the front of the jeep from the doors to the bumper its in the front under the radiator, make it good and snug if not when you turn its a lot of strees on the front of your jeep and it will make noise, i hope that helped .
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