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Unread 11-18-2007, 03:31 PM   #1
steveinmedford
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Rhythmic Vibration over 60 mph

Hey all

Lately I've ben experiencimg a rhythmic vibration when highway driving at speeds over 60mph. Feel vibe at 60, worsens at 65 and starts to get rhythmic there after. Dont really feel in steering wheel. More feel in gas pedal/floor/seat. Can almost hear it too. Not sure though.

By rhythmic I mean I feel a harsh vibration which briefly disapears then returns. At 70 the vibration cycle is harsh vibe for 3-4 seconds, smooth for 1-2 and repeats...etc..

Have new tires with <10K and have had them re-balanced. Shop said that they were out-of-balance but are alright now. I agree...don't feel out-of-balance shake in steering wheel as I did before re-balance. Also have new shocks.

Could the tires have started to wear funny since they were out-of-balance for awhile? No visible uneven wear. What else should I look for/check-out?

Have 2" bb, 1" bl and 1" mml. 100k miles. Need more info? Please ask away.

Thanks Steve

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Unread 11-18-2007, 04:53 PM   #2
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btt on one?
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Unread 11-18-2007, 06:46 PM   #3
00jeepsahara
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ive had a similar vibration for a while now, mine starts earlier though at about 35 mph, wasnt a bad u joint or tire, still trying to figure it out, ill let you know if i get it, or will check here to see if anybody has a solution.
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Unread 11-18-2007, 08:54 PM   #4
DevEmp
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Fill out your profile... that way no one will have to ask about stuff like the year of the Jeep, lack of a SYE, etc etc.
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Unread 11-19-2007, 05:16 AM   #5
Saubaer
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We had a similar vibration problem on one of our Vans a while back. Shop replaced the driveshaft and the vibe was gone.
Maybe there is something going on with the u-joints or centering ball.... Check the Control arm bearings too, maybe a worn bearing brings the driveshaft angles out of whack.
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Unread 11-19-2007, 07:24 AM   #6
Wheelin98TJ
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To help you narrow it down and start the process of elimination, remove the driveshafts one at a time and drive it.

That will tell you real quick if its the front or rear driveshaft that is causing the problem.
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Unread 11-19-2007, 08:00 AM   #7
00jeepsahara
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Quote:
Originally Posted by Wheelin98TJ
To help you narrow it down and start the process of elimination, remove the driveshafts one at a time and drive it.

That will tell you real quick if its the front or rear driveshaft that is causing the problem.
yeah thats a good idea.
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Unread 11-19-2007, 09:44 AM   #8
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Quote:
Originally Posted by steveinmedford

By rhythmic I mean I feel a harsh vibration which briefly disapears then returns. At 70 the vibration cycle is harsh vibe for 3-4 seconds, smooth for 1-2 and repeats...etc..
I have had a similar experience with mine- from new. The cycles are more like 1sec. on 1sec. off, though- around 70+ most noticeable too. I think it's actually body shudder because of its' poor aerodynamics.
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Unread 11-19-2007, 10:05 AM   #9
05tjx
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did it start out of the blue did you go wheeling then came home and it started up. i bent my skid plate a little so now mine vibrates at about 35 top 45 mph. i got a new skid plate just to lazy to put it on
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Unread 11-19-2007, 11:25 AM   #10
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Quote:
Originally Posted by 05tjx
did it start out of the blue did you go wheeling then came home and it started up. i bent my skid plate a little so now mine vibrates at about 35 top 45 mph. i got a new skid plate just to lazy to put it on
Sort of out of the blue. Don't usually drive that fast so not sure how long it may have been there. Not from wheeling or any rough stuff.

Like previously noted, knew there was a tire balance problem that was taken care of.

Drive shaft balance, hmmm, I'll check into that. U joints? Ball joints?

Sounds like there could be a number of causes. Exploring.....

Thanks all respondents, past and future?

Steve
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Unread 11-19-2007, 11:34 AM   #11
FrankGG
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I have that rhythmic vibration too!!! (2005 Rubicon)

It happens pretty suddenly once I hit ~73 mph, sometimes it moves up or down a few miles per hour, but yeah, I get about 1 second of vibration I can feel through the lower 1/2 of the cab, then 1 second of no vibration. No real vibrations on the steering wheel.

Its happened ever since I got my Jeep (I bought it used around July)

I was actually meaning to call Jeep and get it looked at, but I keep putting it off, though I should do it soon.

I asked a while ago about it and people seemed to think it was the driveshaft.
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Unread 11-19-2007, 12:07 PM   #12
Diz
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I have been having the same deal, mines about a 1 second on 1 second off kind of thing.

But i dont understand how a driveshaft can be causing this pulse. If the driveshaft is always moving at the same speed, or relatively the same speed, how can the pulse completely stop and start like this, constantly?

I thought it had something to do with the belts or some other engine parts, but i really have no idea.

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Unread 11-19-2007, 12:10 PM   #13
Dravintoad
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Quote:
Originally Posted by Diz
I have been having the same deal, mines about a 1 second on 1 second off kind of thing.

But i dont understand how a driveshaft can be causing this pulse. If the driveshaft is always moving at the same speed, or relatively the same speed, how can the pulse completely stop and start like this, constantly?

I thought it had something to do with the belts or some other engine parts, but i really have no idea.

03' Rubicon
Just so you know, the driveshaft doesn't constantly move at the same speed.
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Unread 11-19-2007, 12:22 PM   #14
doublins
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Quote:
Originally Posted by Diz
I have been having the same deal, mines about a 1 second on 1 second off kind of thing.

But i dont understand how a driveshaft can be causing this pulse. If the driveshaft is always moving at the same speed, or relatively the same speed, how can the pulse completely stop and start like this, constantly?

I thought it had something to do with the belts or some other engine parts, but i really have no idea.

03' Rubicon
It's pulsing because there must be two slightly different frequency vibrations going on that are causing "beats," where they alternate between cancelling eachother out and amplifying one another- the result is a slow and rhythmic "WHIRR...... WHIRR....WHIRR.... WHIRR....". Probably has to do with a vibration in the driveshaft that is not supposed to be there, interacting with some other normally negligable vibration, coming from somewhere else in the drivetrain or from the tires.

-C
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Unread 11-19-2007, 12:55 PM   #15
hoseclamp
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I had the harmonic cycing vibes too. Did a 3.5" lift, 1" BL/MML, rear CV DS, no TC drop. I read somewhere it could be the thin metal skid emitting vibes, so I built a 1/4" thick steel one, even with a bit more clearance, smooth as silk.
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