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Old 12-25-2008, 11:18 PM
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Exclamation Manual Transmission Vibration

The transmission on my 95 wrangler is starting to vibrate in 3rd and 4th gear but not in first or 2nd. Is this a sign of the clutch wearing out and needing to be replaced? The car had 95K miles on it in 2005 when i got it so im guessing it had never been replaced. It has about 125K miles on it now. It doesnt appear to be slipping at all though. Any input is appreciated!

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Old 12-25-2008, 11:19 PM   #2
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Is it based on gear or speed?

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Old 12-25-2008, 11:24 PM   #3
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what vibrates exactly
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Old 12-26-2008, 05:43 PM
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i can feel what i think is the transmission vibrating a little as im driving. i think its the transmission since it vibrates only in 3rd and 4th gears. 3rd vibrates the whole range of speed, but 4th smoothes out as the rpm's go up. first and 2nd gears are fine, zero vibration, its weird. im wondering if those 2 gears are having an issue since it doesnt feel like its slipping at all.
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Old 12-26-2008, 06:30 PM   #5
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If you stay in 2nd for extra speed does the vibration not start? I was wondering if it is speed related? Still sounds like u-joints to me. Mine was doing the same thing and the front u-joint on the back shaft was toast.
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Old 12-26-2008, 10:28 PM   #6
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ya, little more info. what about 5th gear? wondering if its the speed and it could just be tire balance. tire balance will show up and a certain speed, and then smooth out after the certain speed.
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Old 12-27-2008, 07:36 PM   #7
 
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I just ran into something like this. Is your front diff dis-engaging? I noticed some road vibration in 4 th and 5th gear. I thought I had too much snow on the wheels. I did have a 4x4 light on though. I am replacing my vacuum switch tomorrow to correct this. I pulled out my electical switch for the dash light and used a 1/4" extension to push it into the off position. Just a suggestion.
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Old 12-28-2008, 06:41 PM
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ya the 4x4 light is off, i can tell its not engaged as well...when im going along at vibration speed if i push down the clutch, i get no more vibration, so im guessing its not tire related..im starting to think it might be u-joints..since id think if there was a problem with the trans, the 1st and 2nd gears most likely would not be spared...i dont get noticeable virbation in 5th gear either, just 3rd and 4th
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Old 12-28-2008, 06:42 PM   #9
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Sounds like the u-joint to me. Especially since when you push the clutch in it goes away. Mine was doing the same thing and my u-joint was bad. I actually had 2 bad ones.
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Old 12-28-2008, 09:24 PM   #10
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yep, if it goes away with the clutch check the d shaft u joints first.
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Old 12-29-2008, 07:21 PM   #11
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I have a similar problem and I replaced my u-joints; the vibration is still there. Can this be my t-case?
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Old 12-29-2008, 09:42 PM   #12
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Did you replace all of them?
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Old 12-30-2008, 09:49 AM   #13
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Sure did, no dice...
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Old 12-30-2008, 08:40 PM
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ya i checked mine today and my rear driveshaft u-joint is BUSTED. Just poppin it in neutral and trying to rotate the shaft, i could see the joint rattling around inside the cup where the bearings are SUPPOSED to be. Guess I have a new project, its a relatively easy fix at least.
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Old 12-30-2008, 09:07 PM   #15
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Sounds like the u-joint to me. Especially since when you push the clutch in it goes away. Mine was doing the same thing and my u-joint was bad. I actually had 2 bad ones.
good call man
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Old 12-30-2008, 10:18 PM   #16
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My trans dont vibrate alot I mean no more than usual and my u joints arnt in great shape and my front wheel bearings are going out. But all thats getting replaced asap prolly the ujoints first
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Old 01-08-2009, 03:00 PM
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ya i changed the rear joint and it was BUSTED, all the bearings were dust. i figured while i had it out id change both front and rear joints and now she drives like a DREAM again haha
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Old 01-08-2009, 06:02 PM   #18
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Cheap, easy fix... Glad that worked for you. Whenenver there is a vibration like that that is the first place I check.

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