Clunk on bumps - Page 2 - Jeep Commander Forums: Jeep Commander Forum
Suspension / Lifts This is the place to discuss the suspension, lift systems, and other stuff underneath your Jeep Commander

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post #11 of 21 (permalink) Old 04-04-2019, 11:36 AM Thread Starter
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Put the car on the rack again, had a front end guy looking at it for a second opinion. Going to order lower arms to eliminate the lower ball joint and the rear bushing looks like it could possibly have some wear or clearance. Any suggestions on what brand to get? Looks like a lot of China made arms out there. I see Moog, Mevotech and AC delco have some available

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post #12 of 21 (permalink) Old 04-05-2019, 10:22 AM
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Originally Posted by theturboman View Post
Put the car on the rack again, had a front end guy looking at it for a second opinion. Going to order lower arms to eliminate the lower ball joint and the rear bushing looks like it could possibly have some wear or clearance. Any suggestions on what brand to get? Looks like a lot of China made arms out there. I see Moog, Mevotech and AC delco have some available
If you are at 98,000+ miles and you haven't replaced your front upper differential bushing yet, there is a very good chance that's your problem.

They're typically shot by 80,000 miles and will definitely give that annoying front end clunk every time you hit a decent bump.

Here is an excellent explanation as to why the front upper differential bushings fail so frequently and so early on, as well as a very good thread on the subject below;

Quote:
Josh went on to explain that the upper pinion bushing in the XK/ WK1 is usually the one that fails first (which we all know). However - what I didn't know is that about 75% of the torque and associated stress IS TRANSFERRED TO THAT ONE BUSHING FIRST. Holy cow is that a stupid engineering design for a rubber bushing. The other two take way less of a beating.
https://www.jeepcommander.com/forums...ushings-2.html


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Last edited by Big Blue; 04-05-2019 at 10:34 AM.
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post #13 of 21 (permalink) Old 04-14-2019, 08:02 PM
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i used the Moogs Very happy
Is it true you have to buy a new bracket to use the moog bushings? I need to replace my swaybar bushings front and back.
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post #14 of 21 (permalink) Old 04-15-2019, 02:37 PM Thread Starter
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Update-- I replaced the lower arms and the majority of the noise is gone
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post #15 of 21 (permalink) Old 04-15-2019, 03:10 PM
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Update-- I replaced the lower arms and the majority of the noise is gone
That makes sense; When I had my Superlift installed last November my mechanic told me my Front LCA bushings were complete mush.

I had him drop in a new set of Moog Front LCA's while he was installing the Superlift.

If you still have any residual noise I'd replace that front upper differential pinion bushing; you're definitely due for that repair.


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Last edited by Big Blue; 04-15-2019 at 03:13 PM.
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post #16 of 21 (permalink) Old 04-15-2019, 04:43 PM Thread Starter
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Originally Posted by Big Blue View Post
That makes sense; When I had my Superlift installed last November my mechanic told me my Front LCA bushings were complete mush.

I had him drop in a new set of Moog Front LCA's while he was installing the Superlift.

If you still have any residual noise I'd replace that front upper differential pinion bushing; you're definitely due for that repair.

Probably so I don't know the history but all the bushings look original
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post #17 of 21 (permalink) Old 04-15-2019, 05:08 PM
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Probably so I don't know the history but all the bushings look original
Obviously there is some variation depending on how often the previous owners off-roaded with your XK, but typically, that front upper differential pinion bushing is good for about 70,000-80,000 miles and that's it.

I can tell you from experience, you will hear front end clunks going over bumps when it's bad.


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post #18 of 21 (permalink) Old 04-15-2019, 06:06 PM Thread Starter
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Quote:
Originally Posted by Big Blue View Post
Obviously there is some variation depending on how often the previous owners off-roaded with your XK, but typically, that front upper differential pinion bushing is good for about 70,000-80,000 miles and that's it.

I can tell you from experience, you will hear front end clunks going over bumps when it's bad.

This vehicle didnt have a scratch on the belly before I got it, she was a road warrior, being a California car no rust what so ever and most of the bushings appear to be in good shape but I will keep an eye out for the upper bushing. It doesnt look to bad to change just a little time consuming
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post #19 of 21 (permalink) Old 04-15-2019, 06:47 PM
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Quote:
Originally Posted by Jmac509 View Post
Is it true you have to buy a new bracket to use the moog bushings? I need to replace my swaybar bushings front and back.
Maybe some do?
I replaced mine (front) with moog bushings in factory brackets. No issues.👍🏿
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post #20 of 21 (permalink) Old 04-15-2019, 06:50 PM Thread Starter
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Join Date: Feb 2019
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Quote:
Originally Posted by Big Blue View Post
Obviously there is some variation depending on how often the previous owners off-roaded with your XK, but typically, that front upper differential pinion bushing is good for about 70,000-80,000 miles and that's it.

I can tell you from experience, you will hear front end clunks going over bumps when it's bad.

This vehicle didnt have a scratch on the belly before I got it, she was a road warrior, being a California car no rust what so ever and most of the bushings appear to be in good shape but I will keep an eye out for the upper bushing. It doesnt look to bad to change just a little time consuming
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