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Old 02-23-2012, 01:42 PM   #1
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Question Vibration...Still

A few months ago I had a post concerning a vibration I had and still have. My stock 08 JKU /6spd man. w/51k miles has a vibration related to the engine rpm between 1800 to 2200 rpm's, it does it in 4th gear or 5th gear so it's not related to vehicle speed. anyone ever hear of a clutch causing something like this?

Tom

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Old 02-23-2012, 02:03 PM   #2
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take off ur hitch?

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Old 02-23-2012, 04:56 PM   #3
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Do you get the vibration when you coast in neutral or just when it's in gear? I am guessing it's a Driveshaft u-joint failed or soon going to fail.

Other things to check, Have you had all your tires recently balanced and rotated? Have you checked to see if you are missing any tire weights or recently been mud/snow wheeling? Could have some mud/ice caked up in the rim.
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Old 02-23-2012, 04:56 PM   #4
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??

hitch?
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Old 02-23-2012, 05:01 PM   #5
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If when you're at 1800-2200 rpm's and you disengage the clutch and it doesn't vibrate then I would say that it could be the clutch, or, the flywheel could be out of round causing the vibration. You might need a new clutch.
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Old 02-23-2012, 05:55 PM   #6
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if i leave my hitch in the reciever i get a nasty vibration exactly at 2k rpms.. took it out, all gone..
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Old 02-23-2012, 07:41 PM   #7
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Quote:
Originally Posted by c0d3x5 View Post
if i leave my hitch in the reciever i get a nasty vibration exactly at 2k rpms.. took it out, all gone..

Ok thats just plain silly.


As for the issue at hand. 50k miles...one of your weights on your drive shafts might have come off.. They are welded on..but I have heard of this happening..

The rpm issue...would result in the drive shaft.. preferably the rear. Did you have your gears changed in your diff's...? If so, then if its not your gear's...then its your drive shaft's..

Another possibility is your ball joint's...the lowers go first ..before the uppers...its possible ...if this is a doubt, jack up one side and move the tire up and down...if you hear and see a slight movement..your ball joint's may be bad...which causes your tire to have more play in it when driving.
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Old 02-23-2012, 11:46 PM   #8
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Is the vibration is load dependant? (ie: does it happen under accelleration, constant speed, or coasting, revving in neutral at the trouble speed, or a combination of any of these). A clutch could certainly do this. Even worn/damaged engine or transmission mounts could cause (more accurately pass on to the vehicle) vibration, especially if it is a load dependant vibration. Accessories on the belt can do strange things, but usually happen at several different rpm ranges due to harmonics.

The frequency of the vibration can go a long way to figuring out where it is coming from. Engine related vibration is directly proportional to engine RPM. Valve train-related vibration would be 1/2 engine RPM (except maybe the 3.6 L). Pulley driven equipment 4x, 3x engine RPM or something like that, depending on pulley size. Driveshafts and axle vibration proportional to speed (but may show up at several speeds due to harmonics). Internal transmission vibration would be at gear ratios to engine RPM. You may have to record the vibration if you can hear it (or make it seen or heard when it happens) to get a decent count per minute. Maybe a small bell suspended from the mirror?

Hope that helps.
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Old 02-24-2012, 01:18 PM   #9
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Originally Posted by Revyjku08 View Post
Do you get the vibration when you coast in neutral or just when it's in gear? I am guessing it's a Driveshaft u-joint failed or soon going to fail.

Other things to check, Have you had all your tires recently balanced and rotated? Have you checked to see if you are missing any tire weights or recently been mud/snow wheeling? Could have some mud/ice caked up in the rim.
The vibration is under load..when I push the clutch in it stops. Man it's gotta be the clutch doesn't it?

Tom
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Old 03-04-2012, 07:15 PM   #10
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i have the same problem. when i push the clutch in it goes away. But i took out the rear driveshaft and drove with the front. its all gone. I would try that, but I'm still looking on how to fix the driveshaft problem

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