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Old 12-09-2011, 05:42 PM   #1
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Unhappy HELP! My poor TJ :(

Hey guys,
I'm not sure whats up with my '06 jeep. Tuesday I was delivering fruit and started hearing a clunking sound coming from the rear.
Here's the situation:
1. Just put new 31" Tires and 16" rims on 'er on Thanksgiving day.
2. The only time i hear the KNOCK is when i take my foot of the gas, let it coast, push the clutch in to change gears, or shift into nutral while going some speed.
3. I don't hear the noise when i'm accelerating. I'm 75% sure its not just the engine droaning it out.
Possible Issues:
My grandfather (helps at a garage where the Jeep was origionally bought, very knowladgeable) Thinks it could be U-Joints, or something with the clutch
My dad thinks it might just be some lugs that got worked lose since they are new
My brother ("Master" mechanic(more self proclamed master, point in case: he said i could fit 35"s on my jeep... COMPLETLY STOCK... nuf' said)) Said something about rear pinions (right terminology?) In the rear.

I don't have any idea. I have an appointment made for a local garage (the guy owns a jeep) on thursday.
Any input/ suggestions would be great!
Sorry for rambling
THANKS!!!!

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Old 12-09-2011, 06:07 PM   #2
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Sounds like a bad control arm bushing to me.

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Old 12-09-2011, 06:17 PM   #3
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sounds a little scary... lol. can you explain it please?
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Old 12-09-2011, 06:18 PM   #4
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Did you crawl under and check out any of those possible causes? You should be able to rule in or out at least half of your list with 2 minutes of under-Jeep time.
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Old 12-09-2011, 08:17 PM   #5
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no not yet. We just concreted our shop floor on wednesday, and we haven't had nice dry weather to do it. hopefully tomorrow... What all should i look for while i'm under there?
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Old 12-09-2011, 09:25 PM   #6
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Check for any slop in anything connecting the axle to the frame; ie control arms, trackbars.
Also check for excessive play in the ujoints in the front and rear driveshafts.
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Old 12-09-2011, 11:53 PM   #7
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I'm with control arms. Try shifting ur tire front and back while it's stationary. Keep an eye on ur ca and see if there's play
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Old 12-10-2011, 07:06 AM   #8
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It sounds exactly like a bad control arm bushing. Google images for control arms. They attach via a rubber bushing and they can go bad and get crushed. When this happens, you get slop and movement. At first, it will feel like the jeep is moving slightly when slowing down, backing up etc.... For a second or two. Then will get worse and eventually start making banging noises.

If it is the bushings, I would probably buy a complete set of bushings and replace for the control arms, though you may not need them for all the uppers and lowers. Buy good quality ones.

Here is the problem. Parts are cheap, labor is a bitch. You have to remove the control arms in order to replace the bushings.

As an example, when mine on my Mustang went bad, rather than spending 50 bucks on bushings, I think I spent 250 bucks on new, upgraded control arms with new bushings. Same work but better results. On a 500 hp Mustang, control arms mean everything. On a jeep, not so much though.

Crawl under the jeep and look for any signs of play or slop at any point where a suspension component is attached. You won't likely be able to move anything by hand, but you will see signs of scraping or rubbing. Hard to explain, but you will know it when you see it.
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Old 12-10-2011, 08:24 AM   #9
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Seems like a decent tire shop would have noticed bad control arm bushings...that's how I found out mine were bad on my 350z. I couldn't tell just driving but the inside of the tires were wearing funny and upon inspection they were going and one was obviously shot.

Good luck!
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Old 12-10-2011, 08:50 AM   #10
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If it's the bushing? That would be the time to LIFT if you were going to? But you bought tires.Hmmmm.
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Old 12-10-2011, 06:21 PM   #11
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Yea, we monted the tires on the jeep ourselves. Got them moutned and ballanced at Walmart (for free ) then got it alligned at a local shop... I wasn't too happy with the allignment, seemed to me the streeing wheel really started to shimmy. I'm fairly certain thats not the Death Wobble.

Tightned up all the lugs tonight, found out I was missing one on the right rear wheel. Torqued them to 90. What do you reccomend i torque them to?

My brothers buddy is coming over sometime because he has had experience with Rear Pinions and such, so he's gonna look at that.
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Old 12-10-2011, 06:25 PM   #12
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Quote:
Originally Posted by BeerMan View Post
Seems like a decent tire shop would have noticed bad control arm bushings...that's how I found out mine were bad on my 350z. I couldn't tell just driving but the inside of the tires were wearing funny and upon inspection they were going and one was obviously shot.

Good luck!
Funny you say about the tires wearing on the inside... Before i put these new tires the old ones were worn kinda weird. My sister said she kept rotating them to try to make it work. I'll really have to check that too
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Old 12-12-2011, 10:45 PM   #13
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I torque at 100

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