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post #1 of (permalink) Old 09-10-2002, 08:46 PM Thread Starter
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clunk clunk under acceleration (atlas problem?)

my tj has developed an odd clunk clunk clunk when I'm accelerating. the u-joints ALL look good and I have locking hubs on the front. the lockers are ARB's ad are certianly disenguaged. the suspension is a RE long arm kit ad I have driven it about 5000 miles on the road and about 80 hours on the trail. the tranny is an nv4500 and the transfer case is an atlas II. both the tranny and t-case were new from advanced adapters 5500 miles ago. on my last trip to go wheeling, I noticed the case was getting hot, I looked at the sight tube on the atlas and saw it was a bit low, so I dumped a quart of gear lube in it. the case ran a lot cooler then.... I wheeled the jeep for 4 days and drove it 5 hours home. a week later I develop this strange clunk, i can even feel it a bit and its only when I'm on the gas.
1. think i burned something up in the atla$$$$$$$?
2. could a bad cv joint in the rear driveshaft cause this?
3. anyone ever been inside an atlas?? is it like any other gear driven case?
need to get this diagnosed soon... dixie run is looming...
thanks,
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post #2 of (permalink) Old 09-10-2002, 09:11 PM
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Re: clunk clunk under acceleration (atlas problem?)

have you checked your tranny mount? how about making sure the mouninh bolts/studs for the t-case to adapter and adapter to the tranny are tight. is you shifters hitting the body? just some thoughts
post #3 of (permalink) Old 09-11-2002, 02:19 AM
 
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Re: clunk clunk under acceleration (atlas problem?)

my new tj does the same thing. For me it is the rear tracbar bolts working loose, I'd check that and all your control arms. good luck!
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post #4 of (permalink) Old 09-11-2002, 05:33 AM Thread Starter
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Re: clunk clunk under acceleration (atlas problem?)

thanks for the ideas guys... but this clunk starts in 2nd gear and in always present while accelerating..clunk clunk clunk.. gets faster as speed increases..
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post #5 of (permalink) Old 09-11-2002, 05:48 AM
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Re: clunk clunk under acceleration (atlas problem?)

Just a thought here, but could it be the rear end, perhaps there is a tooth missing. A buddy of mine had the same kind of problem, and we couldn't figure it out. Finally after about 2 weeks it got really bad, we pulled the diff cover in the back, and sure enough... A huge mess.
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post #6 of (permalink) Old 09-11-2002, 06:01 AM
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Re: clunk clunk under acceleration (atlas problem?)

For me, my yoke nut was working itself loose causing the CV to make the clunk noises. I re-tightened it and the clunk's have disappeared. The symptoms sound very much like yours, but, mine would start at take-off and 2nd gear, my deaf-[censored] couldn't hear anything after that.
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