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Old 01-09-2012, 08:19 AM   #1
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Occasional Rear End CLUNK - Normal or Issue?

I have a manual 6sp and I occasionally get a clunk that sounds like it comes from my rear end when I take my foot off the gas, coast and then apply the gas again. Sometimes it also happens when slowing down and shifting or speeding up and shifting… Basically any time there is a little slack in the drivetrain and then I apply the gas.

I changed my differential gear fluid this weekend and didn’t see anything unusual. The metal filings on the drain plug looked normal (not a lot and very fine).

Is this clunk relatively normal with JKs or should I make an appointment to have my dealer look at it?

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Old 01-09-2012, 09:13 AM   #2
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I think I would check the ujoints and yokes for play. It could be a lot of things. Shake everything and look for play or looseness.

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Old 01-09-2012, 09:19 AM   #3
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My front pas flare was loose clunking around
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Old 01-09-2012, 09:32 AM   #4
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my 03 rubicon had similar clunk-and ending up being the upper shock mounts. Replaced them all with Bar Pin Eliminators and problem was solved. However, we learned the hard way...before you install them, coat the bars and caps with anti-seize. Had the really work hard when we replaced the shocks 3 years later!
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Old 01-09-2012, 09:54 AM   #5
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Quote:
Originally Posted by NHrubicon
my 03 rubicon had similar clunk-and ending up being the upper shock mounts. Replaced them all with Bar Pin Eliminators and problem was solved. However, we learned the hard way...before you install them, coat the bars and caps with anti-seize. Had the really work hard when we replaced the shocks 3 years later!
I had an 03 subaru wrx that had bad shock mount "top hats" and thought it was driveline for ever ..
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Old 01-09-2012, 10:50 AM   #6
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Thanks for all the feedback and ideas. Keep them coming.

Sounds like I have some different components I need to check. At one point I did shake the rear drive shaft at the yoke looking for play, but it didn't budge. Also tried to rotate the drive shaft looking for some play there, but it didn't budge either. I will check both again just to confirm.

For those that had issues with their top shock mount, what is the best way to check those? Should I just get under the Jeep and try to move the shocks around or would it be better to unbolt the bottom shock mount and try to shake the top shock mount?
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Old 01-09-2012, 11:01 AM   #7
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Quote:
Originally Posted by GreenRubi
Thanks for all the feedback and ideas. Keep them coming.

Sounds like I have some different components I need to check. At one point I did shake the rear drive shaft at the yoke looking for play, but it didn't budge. Also tried to rotate the drive shaft looking for some play there, but it didn't budge either. I will check both again just to confirm.

For those that had issues with their top shock mount, what is the best way to check those? Should I just get under the Jeep and try to move the shocks around or would it be better to unbolt the bottom shock mount and try to shake the top shock mount?
Just visual I believe. Back when I had my Tj, a shock bushing totally worked its way out. No noises though.
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Old 01-09-2012, 03:59 PM   #8
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Do you have a limited slip rear diff? I've had them make a popping noise that sounds/feels like the body moved on the frame with a "pop". Especially when cold and turning from a stop.
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Old 01-10-2012, 04:11 PM   #9
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Do you have a limited slip rear diff? I've had them make a popping noise that sounds/feels like the body moved on the frame with a "pop". Especially when cold and turning from a stop.
I've got the stock 2008 Rubicon 4.10 Tru-Lock axle, which I've read is a helical type (gear driven) limited slip axle when it is not locked. Someone correct me if I have this wrong.

I went under my Jeep today and tried to find anything that might be loose. I tried to move the driveshaft, shocks, control arms, track bar, even tried to wiggle the transmission and everything seems tight.

With the parking break on and the Jeep out of gear I could spin the driveshaft back and forth about 1/2 of an inch. I'm wondering if what I hearing is just that little bit of play and whether that is normal?
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Old 01-10-2012, 04:18 PM   #10
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Have you checked your rear sway bar links to make sure they are tight?
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Old 01-10-2012, 04:20 PM   #11
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Have you checked your rear sway bar links to make sure they are tight?
I didn't. That is a good idea. Thanks.
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Old 01-10-2012, 05:17 PM   #12
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I've got the stock 2008 Rubicon 4.10 Tru-Lock axle, which I've read is a helical type (gear driven) limited slip axle when it is not locked. Someone correct me if I have this wrong.
Nope. The stock Rubicon has an open diff. when not locked. So that's not the source of your noise, like mine was.....
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Old 01-11-2012, 10:22 AM   #13
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I checked the rear sway bar links and they are solid.

Did some more reading and it is possible what I'm hearing is just drive line slack. In second gear if I apply the gas, let it off, apply it again, let it off, etc., I can reproduce it regularly. I also hear it on the highway when I have cruise control enabled, go down a decline, cruise control lets off a bit, then when it re-enables I get a clunk.

My clunk is very similar to the drive line slack example in this YouTube video:



Should I just consider this normal? It has probably been happening all long (I bought my Wrangler used), but now that I've noticed it I'm hearing it constantly.
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Old 10-19-2012, 05:18 PM   #14
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Did you find if this was unusual GreenRubi? I have a similar clunk and a similar sound/amount of play in my rear driveshaft. The play is at the Transmission.

Anyone else chime in if you like...
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Old 10-19-2012, 06:36 PM   #15
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I consider it normal. Only because I have owned pickups with manual transmissions and they had the same noise. There is a certain amount of play in the drivetrain. When you step on the gas after coasting, the play is quickly taken up and the metal to metal contact makes the noise.

However, still worthwhile to have it checked out just to be safe.

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