The never ending front end clunk - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 16 (permalink) Old 05-20-2016, 07:19 PM Thread Starter
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The never ending front end clunk

I've researched the issue I'm having and have tried just about every damn fix there is.

Have a loud clunk when hitting bumps, potholes and speed bumps... almost seems like it's when the suspension is unloading that it clunks.

So Far
- Tried with sway bar disconnected and both sides still clunk.
- New lower control arms / bushings
- new sway bar bushings
- new sway bar links
- all 3 new front diff bushings

Both hub bearings and cv shafts seem nice and tight.
Upper control arm is nice and tight.
All bolts / nuts are tight.

I have the OME 2" lift with HD springs and I have the strut out now trying to tighten the top nut but of course it just spins the shaft and my spring compressors wont fit in the damn coils! The nut is already down about 9 threads and it doesn't seem to have any play but I'm running out of ideas.

Any thoughts other than to run the damn thing in the lake?
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post #2 of 16 (permalink) Old 05-21-2016, 01:17 AM
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The first thing that jumps out at me is - why are you running HD coil springs?

Unless you are routinely towing an obscene amount of weight, I'd ditch the HD coil springs and replace them with factory OME coil springs.

I replaced my rear coil springs when I had my Bilstein 4600 shocks and struts installed, but, I just had the factory standard duty coils springs installed; in fact these are the springs I had put in:

06-08 XK Rear Springs – Mopar #52124213AA_52124214AA #52124213AA_52124214AA

If you want a real in depth analysis, there are other posters here like Mongo & a49erFan that can give some more in depth insight than me.

But as I said, I don't think running HD springs which is giving you a harder, stiffer ride is helping your cause very much.


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Last edited by Big Blue; 05-21-2016 at 04:33 AM.
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post #3 of 16 (permalink) Old 05-21-2016, 09:18 AM Thread Starter
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Yeah, I agree that they are probably too much but my original plan was to run an aftermarket bumper with winch but none of that ever materialized.

The ride actually isn't that bad and the only real issue is the banging in the front end.

Not sure if putting regular springs on there would stop the banging anyways??

About the only thing left that could be causing this problem is the steering rack... I've read about adjusting the E20 bolt but most people say that issue makes a noise when turning and mine is when going straight.
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post #4 of 16 (permalink) Old 05-22-2016, 01:54 AM
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Quote:
Originally Posted by bncrshr77 View Post
Yeah, I agree that they are probably too much but my original plan was to run an aftermarket bumper with winch but none of that ever materialized.

The ride actually isn't that bad and the only real issue is the banging in the front end.

Not sure if putting regular springs on there would stop the banging anyways??

About the only thing left that could be causing this problem is the steering rack... I've read about adjusting the E20 bolt but most people say that issue makes a noise when turning and mine is when going straight.
Well my thinking is the extra rigidness of the ride is what may be causing - or at the very least, contributing to the clunking that you are experiencing.

I could very well be wrong, just throwing it out there.


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Last edited by Big Blue; 05-22-2016 at 01:59 AM.
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post #5 of 16 (permalink) Old 05-24-2016, 05:13 PM
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What did you torque your LCA down to?

Ill bet its that strut bolt. There are flat spots on the top of the shaft. You need to get a wrench on there to hold it in place and a wrench on the bolt. I had to tighten mine down with it installed on the vehicle.

Milton's Jeep Build - Page 4 - JeepForum.com

Oh **** i almost forgot! Tighten the steering rack!
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post #6 of 16 (permalink) Old 05-25-2016, 12:11 AM
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I've just skipped over this thread for a while, not realizing that this sounds like it pertains to me quite a bit. I gained this issued when I installed my 2" lift from DayStar, but not initially, and on the rear instead of the front. I first discovered that my rear (stock) shocks weren't long enough, and it was a terrible but obvious clunk of the shocks fully extending... hard, everytime i went over a speed bump. So i ordered a couple for 2" lifts, now I've got what I'm interpreting to be the same (as yours) clunk in my rear shocks. Just fruit for thought. It stopped direly annoying me after the first year.
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post #7 of 16 (permalink) Old 05-25-2016, 04:46 PM
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Quote:
Originally Posted by SkulhunterM42 View Post
I've just skipped over this thread for a while, not realizing that this sounds like it pertains to me quite a bit. I gained this issued when I installed my 2" lift from DayStar, but not initially, and on the rear instead of the front. I first discovered that my rear (stock) shocks weren't long enough, and it was a terrible but obvious clunk of the shocks fully extending... hard, everytime i went over a speed bump. So i ordered a couple for 2" lifts, now I've got what I'm interpreting to be the same (as yours) clunk in my rear shocks. Just fruit for thought. It stopped direly annoying me after the first year.
Which shocks are you using?

A lot of rear "2" lift" shocks are generic and fit multiple vehicles. Its pretty common for them to have narrower bushings and eyelets. You might check and see if there is space there. I had to use several washers to close the gap for my Bilstein 5125's in the rear.

ALSO if you do not clearance your gas tank skid then your rear LCA will hit the skid on full droop. I had to clearance mine several inches. This is very common once you get longer shocks, as the stock shocks were the droop limit previously.

I'll bet you its one of those two things!
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post #8 of 16 (permalink) Old 05-27-2016, 12:57 AM
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Quote:
Originally Posted by luckyse7ens View Post
Which shocks are you using?

A lot of rear "2" lift" shocks are generic and fit multiple vehicles. Its pretty common for them to have narrower bushings and eyelets. You might check and see if there is space there. I had to use several washers to close the gap for my Bilstein 5125's in the rear.

ALSO if you do not clearance your gas tank skid then your rear LCA will hit the skid on full droop. I had to clearance mine several inches. This is very common once you get longer shocks, as the stock shocks were the droop limit previously.

I'll bet you its one of those two things!
I'll check that out when I take my jeep almost completely apart tomorrow, thanks. although I think we're getting slightly derailed from OP's issue.
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post #9 of 16 (permalink) Old 05-27-2016, 01:34 PM
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Originally Posted by SkulhunterM42 View Post
I'll check that out when I take my jeep almost completely apart tomorrow, thanks. although I think we're getting slightly derailed from OP's issue.
Let me know how it goes.

Yeah maybe slightly off topic, but its still suspension noise and that's relevant. Maybe it helps OP as well.
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post #10 of 16 (permalink) Old 06-02-2016, 09:06 AM Thread Starter
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Thanks for the responses! Got my E20 socket in last night along with some spring compressors that will actually fit in the srpings!

Will tighten the rack first and then the springs and see what happens!

I don't have any clunks in the rear but I'll check that anyhow.

EDIT... The rack did have some slop but didn't fix the thud in the front end.

Last edited by bncrshr77; 06-02-2016 at 10:37 AM.
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