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Old 02-06-2007, 04:48 AM
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new drive line vibrations

after towing a much heavier rig through the sand dunes i've developed a small driveline vibration. Also i did notice one of the Tcase spacers was missing as well.

Tow bar was bent to the sh1thouse, and is now removed.

I turned up a spacer at work and the Vibration went from really nasty to only slightly annoying now.
Small vibraion while under power. Goes away when clutch is depressed.

also vibration is dramatically reduced when in 4wd.

It's a TJ wrangler.

Any ideas? Unis seem to have no play when tested by hand

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Old 02-06-2007, 07:21 AM   #2

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Check all drive line bolts. Check t-case mounting bolts. If still there, pull shafts and really check them out. Also you could pull the rear shaft only and see if the vibs still there as you drive slowly with just the front in 4h.


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Old 02-06-2007, 11:42 AM   #3
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check your u-joints
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Old 02-06-2007, 01:08 PM   #4
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Also check your tranny mount. When you say it's not there when the clutch is in and then something pulled on your rig so hard that you dropped something out then you very well might've ravaged your tranny mount.
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Old 03-13-2007, 04:27 AM
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well put 2 new unis in and still there.

took the car for a drive without rear drive shaft in and was completely gone. So that rules out clutch and gearbox (but not gearbox mount). Got to be something out the back end

could it be the mount or maybe even the diff? no noise coming from diff though.

vibration gets worse with a load in the jeep.

when i shake the rear drive shaft seems to be a bit of movement in the transfer case. Maybe it is the mount? or could i have damaged the stock slip yoke?

I also turned up some new TC drop spacers that droped the TC an extra 5mm. This actually made the problem worse, so put the old ones back in.
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Old 03-13-2007, 10:13 AM   #6
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is ur driveshaft straight and balanced?
'90 YJ, ford 8.8, SOA, lincoln front, aussie rear, 4.88s, swampers.
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Old 03-13-2007, 03:19 PM   #7
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i have gone through everything exactly as you descricbe. Have you gone through any deep water lately? Or a lot at any point in time?
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Old 03-13-2007, 05:02 PM
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no havn't been through deep water lately.

and i didnt actually get the drive shaft balanced after replacing the unis. but it is straight.

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