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Unread 04-24-2012, 12:53 AM   #1
wolfsbane84
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Wrangler TJ shaking on take off.

Hey guys/girls, got a quick question. I finally got the old black jeep up and running with a used 4 cylinder motor. After troubleshooting it and making sure it was safe to drive every day, I finally got to bring it out here... and I LOVE IT!! I don't care if it does have four squirrels rattling around under the hood... its great. Anyways, on to the reason I am asking for help, the only problem that I can find with it is that during taking off (from a dead stop, in 1st or in reverse) the jeep shudders a bit when letting off the clutch. If I push down on the gas a bit it goes away, but when I am trying to creep or crawl slowly into a parking spot or something, it shudders a lot. The previous owners put a 3 inch lift kit on it and installed some 31's also. I am not sure if they altered anything else (transfer case drop or engine raise) so I think this may be the problem. I also found while reading that some people say its because of a oil leaking into the clutch. I will try to get some pictures of everything under the jeep tomorrow and post with this thread. It only has this problem while starting from a dead stop. As long as there is any momentum in either direction, the jeep rides smooth.

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Unread 04-24-2012, 01:35 AM   #2
igrok
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I had a similar issue and it turned out to be a grommet bushing for the torque arm on the tranny. I would check that and the rubber mount for the tranny.
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Unread 04-30-2012, 07:59 PM   #3
wolfsbane84
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Thanks for the advice. I am going to take the skid plate off this weekend and check the grommets and stuff to see if that is it. IT seems like it gets worse the longer I drive. Like if the jeep just goes in the morning it doesn't do it until later in the day until I drive for a while.
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Unread 04-30-2012, 08:51 PM   #4
Mean Max
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Your symptoms are consistent with a "smoked" clutch, or in other words, a clutch that has seen some severe slippage. This slippage typically builds heat from the friction, resulting in "hot spots" that produce an uneven flywheel/clutch disc surface.

Slippage can be caused from oil on the flywheel from a leak, or from the poor clutch engagement practices of an inexperienced driver.

The foolproof remedy would be to completely replace the clutch & flywheel, and to repair the oil leak/train the driver to prevent the problem from recurring.

Max.
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Unread 05-02-2012, 11:54 AM   #5
flnbar
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Hi-jack engaged! (sorry)

I'm having the exact same issue but my problem started before I replaced the clutch and showed it's head very soon after the new clutch was installed by a dealer (broken teeth on flywheel so had them replace clutch while it was open). I can't be that bad of a driver to cause it before and after a NEW clutch, can I? I've been driving manual trans since highschool. Could this possibly be a side effect of the 2.5" RC lift?
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Unread 05-02-2012, 12:16 PM   #6
RaggedOleMan
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Another thought: The rear pinion angle may need dialed in. A 3" lift will change the axle pinion relationship to the t-case. Does the OP have adjustable rear upper control arms to better adjust the pinion angle? SYE?

When from a dead stop you hit the accelerator, the weight of the rig shifts and essentially loads the rear. This shift changes the pinion angle just a bit. Once you shift gears and/or forward momentum is established the pinion angle relaxes/returns.
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Unread 05-02-2012, 12:20 PM   #7
TheBoogieman
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Quote:
Originally Posted by flnbar View Post
Hi-jack engaged! (sorry)
Could this possibly be a side effect of the 2.5" RC lift?
A lift has NOTHING to do with a clutch.Nope,the clutch was probably installed incorrectly.I had a clutch installed years ago and it wouldn't shift into any gear after it got hot.Pressure plate was torqued down too much.Unless a mechanic is a Jeep mechanic,they know NOTHING about real Jeeps.
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Unread 05-02-2012, 12:23 PM   #8
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Quote:
Originally Posted by RaggedOleMan View Post
Another thought: The rear pinion angle may need dialed in. A 3" lift will change the axle pinion relationship to the t-case. Does the OP have adjustable rear upper control arms to better adjust the pinion angle? SYE?

When from a dead stop you hit the accelerator, the weight of the rig shifts and essentially loads the rear. This shift changes the pinion angle just a bit. Once you shift gears and/or forward momentum is established the pinion angle relaxes/returns.
Come on RaggedOleMan,I never did adjustable CA's with any lift and no problemo (thats spanish)
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Unread 05-02-2012, 12:53 PM   #9
RaggedOleMan
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Originally Posted by TheBoogieman View Post
Come on RaggedOleMan,I never did adjustable CA's with any lift and no problemo (thats spanish)
Well then, you're a daisy if ya didn't. That's English.
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Unread 10-23-2012, 09:31 PM   #10
getincrumpdup
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vibration rear end at start out from stop

1

Last edited by getincrumpdup; 10-23-2012 at 09:45 PM..
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Unread 10-23-2012, 09:45 PM   #11
getincrumpdup
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jeep wrangler rear end vibration

well after experience it usually is the tranny mount attached to the skid plate but first check the skid plate bolts to be grabbing onto the skid plate. my issue was the 2 center bolts on the skid plate slipped from wear or rusting. quick cheap fix was to add 6 .22 cent washers to the bolts to make up the gap in the skid plate holes and then i tourqued the skid plate bolts back in. $1.50 in parts total. problem resolved. apparently from normal wear the bolts pushed threw the holes on the skid plate causing a compromize in the integrity on the strength of skid plate to the frame which lessened holding the tranny tightly causing the vibration like a possible bad mount. save money check that bolts are holding correct and tight!
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Unread 10-23-2012, 10:10 PM   #12
Motas
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Check whether it has a SYE or not. I got vibes after a 2.5" lift and went away after SYE. Easy to tell. Look under at the driveshaft. It will either slide in and out of the transfer case or extend halfway down the shaft. Also without a sye it will have a rubber boot off the back of the tc.
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