'Clunk' noise when starting from a stop - JeepForum.com
 
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post #1 of 8 Old 07-02-2005, 02:51 PM Thread Starter
SmithersGS
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'Clunk' noise when starting from a stop

When I'm stopped at a light and start to go forward, there's a 'clunk' noise from the rear of the jeep. It doesn't happen every time, and usually doesn't occur only when I let the clutch out slowly and start rolling very, very gradually. It happens almost every time I start to roll when starting on a hill, going uphill. I got the lift installed with 7300 miles on the jeep, and I'm at about 12K now. I lowered the TC but have not gotten the SYE yet.

Is this the U-joints telling me it's time for the SYE and a CV driveshaft? And if so, do I have any time before this driveshaft NEEDS to be replaced?

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post #2 of 8 Old 07-03-2005, 04:56 AM
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Loud clunks during take off are usually loose control arm or track bar. I would check the torque on all of them. If you rock it back and forth when parked do you hear the sound?

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post #3 of 8 Old 07-03-2005, 06:14 AM
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Are you sure it's coming from the rear of the Jeep? I also heard a clunk sound when taking off and could feel the slight vibes in the floorboard. Turns out it was a tranny mount busted.
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post #4 of 8 Old 07-03-2005, 08:46 AM
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Just another opinion, i have a hitch on the back and my exhaust pipe hits pretty hard on take off most of the time, maybe that might be it

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post #5 of 8 Old 07-03-2005, 09:20 AM
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With regards to a lift that seems to require an SYE, your u-joints could be toast. Seems to be anything around 3" is a good idea to have sye/cv, over that and you should have one.

Are you getting any vibrations? That will be what causes the wear on the joints, this can also lead to pinion seal failure.

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post #6 of 8 Old 07-04-2005, 05:13 PM Thread Starter
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Well...

The noise is definitely from the rear of the Jeep - when it first started happening I'd look in the back to see if there was a tow hook or some other part bouncing around back there.

It doesn't happen when I rock the jeep at all. My suspension's in great shape, no wobbles or anything out of the ordinary. There is still a tiny amount of vibes through 2nd gear, but it's almost unnoticeable.
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post #7 of 8 Old 07-04-2005, 06:09 PM
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I might have the same thing....does there appear to be any relation btw the clunk and your RPM's? Mine clunks more when RPM's are low...thinkin mine might be a loose muffler or something...
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post #8 of 8 Old 07-04-2005, 07:18 PM
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A bad tranny mount is a likely culprit, loose ujoints also cause clunks. Put on your parking brake, put your Jeep in neutral and climb underneath. Try twisting the driveshaft back and forth, push it up and down, and see if there's any play in the ujoints.

While you're down there you can check out your bushings and hardware. It's surprising how stuff loosens up, even falls off sometimes. A loose pinion nut on the diff can also make the same type of sound.
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