Driveline vibration -
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post #1 of 4 Old 04-14-2010, 03:25 PM Thread Starter
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1993 YJ Wrangler 
Join Date: Aug 2007
Location: Leesburg
Posts: 566
Driveline vibration

Last night I picked up a real nasty driveline vibe and can't quite pinpoint where it's coming from. I've had a slip yoke elim kit in for a while. All ujoints are still intact. My rear axle is shimmed correctly. CV joint on the rear driveshaft is still in good order. Front driveshaft doesn't appear to have anything wrong either. About a month ago my throwout bearing began to whine when I would push the clutch in. As of last night when I'm in gear there's a distinct click/clunking noise when I'm in motion, both drive and reverse. When I removed the rear driveshaft I noticed that the output yoke on the sye has a little slide play on the output shaft, maybe 2mm or so. When i coast in neutral the noise/vibe is sporadic. Any input would be great guys. Thanks.

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post #2 of 4 Old 04-14-2010, 03:30 PM Thread Starter
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1993 YJ Wrangler 
Join Date: Aug 2007
Location: Leesburg
Posts: 566
Btw specs on my jeep:
231 w/ teraflex super short sye kit
stock axles with 3.73s
34" LTBs

bad driverside hub and a busted driver side axle ujoint. The hub has been bad for about 5 months now and the axleshaft ujoint blew out about a month ago. The noise and vibe do not seem to be coming from the front axle..
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post #3 of 4 Old 04-14-2010, 04:17 PM
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1990 YJ Wrangler 
Join Date: Apr 2010
Location: Texas
Posts: 18
Does it only happen when you're in gear and gasing or driving whenever where ever?

Mine used to vib pretty bad when I'd be in 3rd gear and give it gas, and thats a sign of my driveshaft. And what ya know, Ujoint had a hole blown in the cap.

Move your driveshafts yolk in and out every way and see if they have slack in the joints. If they do, then your Ujoints are going out.
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post #4 of 4 Old 05-06-2010, 01:10 AM Thread Starter
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1993 YJ Wrangler 
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Posts: 566
Well, I pulled the rear driveshaft the other day and discovered that the CV join itself had grenaded (even before the ujoints blew, weird). Had a driveshaft shop fix the shaft and build another has a spare. I guess my driveline angles need to be adjusted. My rear shims aren't enough, so I've ordered some new perches to swap in and adjust my pinion angle. I'm also getting new shackles all around to lower my lift a little, my current ones are 1.25" lift.

Luckily the culprit was nothing severe. Although, for the week or so that i was rear driveshaftless, driving around in 4Hi tweaked the already-beaten-to-death-clutch. Fun stuff.
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