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Old 12-27-2013, 10:06 PM   #1
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serious clunking noise

randomly I will get a very loud very hard bang from my drivetrain. it seems to me that its coming from my transfer case. it feels like its coming out of 4wd at 40mph but I have adjusted the linkage 100 times and still no change I thought maybe it was catching or something but no luck. I recently installed a permanent lock on the front axle I got sick and tired of the vacuum stuff and it didn't start this till after the install.

I checked all the fluids when I installed and topped them up (t-case, trans, front and rear axles).

I do know that with the permanent lock installed the front driveshaft will turn when going down the road and that since this isn't a normal operation that's possibly what caused the problem to surface. Im thinking t-case chain. ive checked the u joints, wheel bearings....everything can check without unbolting anything.
the trans has 70-80000 on it and as far as I know the t-case is original with 240000?
Im fairly new to jeeps ive been researching this problem for a while now and nothing fit the suit. any help is appreciated.
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Old 12-27-2013, 10:38 PM   #2
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When I bought my YJ I had a pretty heavy clunk when I would hit a bump. Turns out my rear track bar mount on the axle was broken, leaving the bar free to smack the crap out of the rear axle. I simply removed the track bar and the clunk went away.

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Old 12-28-2013, 08:29 AM   #3
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ive already dealt with that clunk haha I took it off
it only does it in a pull and randomly then
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Old 12-28-2013, 11:10 AM   #4
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Quote:
Originally Posted by Bad Cornflakes View Post
When I bought my YJ I had a pretty heavy clunk when I would hit a bump. Turns out my rear track bar mount on the axle was broken, leaving the bar free to smack the crap out of the rear axle. I simply removed the track bar and the clunk went away.
Literally the exact same thing was wrong with mine. It provides a pretty obnoxious bang
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Old 12-28-2013, 11:34 AM   #5
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Quote:
Originally Posted by 4.2sahara View Post
ive already dealt with that clunk haha I took it off
it only does it in a pull and randomly then
Could be a busted trans mount, that would cause all of your symptoms. Could be a ujoint, or worse case could be your rear differential about to die.
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Old 12-28-2013, 02:16 PM   #6
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Is the t case chain a possibility or am I way off course? I hope it's not the diff that would be a killer on me right now
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Old 12-28-2013, 02:24 PM   #7
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I had some egged out bolt holes on the shock mounts. When I repaired the mounts, the clunks went away.
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Old 12-28-2013, 02:27 PM   #8
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Does this happen on turns or going straight, accel or decel?
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Old 12-28-2013, 05:42 PM   #9
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straight or in turn a turn and accelerating. I installed new trans mounts and engine mounts. I don't think its the u-joints I check them they are all good and if it were a joint wouldn't it be consistent? and its completely random but when it does it does it 3-4 times and then no more till next time
just for reference have you ever driven down the road at 35-40 or so in 4wd (childish I know) and it comes out of 4wd? that's what it feels like
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Old 04-26-2014, 06:27 AM   #10
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Did you ever figure this out? Mine just started doing the same thing this morning. Very loud hard clunck/bang coming from the drivetrain. Feels just like its popping out of 4wd at 40mph.
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Old 04-27-2014, 03:33 PM   #11
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I'd pull the back cover off my Transfer case an check or change the chain. You can do this from under the Car with out pulling the transfer case out!
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Old 04-28-2014, 08:27 PM   #12
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I installed a new chain and that didn't help. I removed the front driveshaft that didn't help. I rebuilt the rear diff, greased everything, changed fluids; no help! I had my t-case apart and found some small pieces of plastic like a spacer or bushing. I believe my problem is in the main drive in the t-case. I just bought another jeep to build. Take 2 and make one. I'll rebuild the tcase and hopefully that helps. I'll keep everyone posted

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