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post #1 of 9 Old 04-18-2013, 02:51 PM Thread Starter
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Mechanical Vibration

First, There is no clear forum to post up mechanical problems in. This isn't a "stock" question, but I don't think it qualifies as modified tech either, so mods feel free to move this if need be.

After a Saturday wheeling in the granite at K2 I have a strange mechanical vibration coming from the drive line. I feel it in the peddles at 38-41mph, and again from 60-62mph, but nothing in between nor before or after. It is not RPM related as the vibration will occur in any gear it seems like. I thought perhaps drive shafts, (haven't pulled them to check play in the joints yet) but there is no grease that I can see that has been slung from a torn boot, although there is a slight, inch and half or so, visible tear in the front boot.

I'm sort of at a loss as nothing is obvious and it really is only a slight vibration.

for reference this is a 4 door, 2.5" of lift with lower adjustable control arms.

Thoughts?

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post #2 of 9 Old 04-18-2013, 02:53 PM
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Maybe spun a tire on the rim causing vibe issues from the now unbalanced wheel. You can try rotating the tires to see if it changes.

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post #3 of 9 Old 04-18-2013, 04:00 PM Thread Starter
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its hard to put into words but it isn't a tire wobble. I would feel a tire wobble in my seat and in the steering. That isn't the case with this.

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post #4 of 9 Old 04-18-2013, 04:51 PM
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It has to be something in the drive train after the t-case if it's not rpm sensitive and only speed sensitive. I would say a dented drive shaft, bad u-joint or tire problem. Could be as simple as mud packed inside a wheel.

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post #5 of 9 Old 04-18-2013, 05:10 PM Thread Starter
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how bad would a drive shaft have to be dented in order to cause this??

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post #6 of 9 Old 04-18-2013, 08:02 PM
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not very. it spins at 3-4 times the speed of your tires depending on the gearing your rig has.

a driveshaft vibration can often be summed up as a HARMONIC vibration. a tire balance issue usually equates to a jackhammer feeling. a driveshaft will feel more like... well... your phone on vibrate.

you could have dinged it or bent it slightly.


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post #7 of 9 Old 04-18-2013, 10:28 PM Thread Starter
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I think that's what happened then while playing in the rocks. In that case I'll disconnect the front and test it out as I suspect that's the one that will be the culprit.

If the front drive shaft is indeed the problem, would there be any issues running around without a front drive shaft for any length of time?

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post #8 of 9 Old 04-19-2013, 04:56 AM
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Quote:
Originally Posted by tvernon View Post
I think that's what happened then while playing in the rocks. In that case I'll disconnect the front and test it out as I suspect that's the one that will be the culprit.

If the front drive shaft is indeed the problem, would there be any issues running around without a front drive shaft for any length of time?
It won't hurt anything. You can run without it as long as you like.

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post #9 of 9 Old 04-19-2013, 10:37 AM
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What your describing sounds exactly like what happened to me after running Tabasco Twister in Las Cruces, New Mexico. All the way home I had a really annoying vibe coming from what felt right under the center console. After getting home I had the front shaft rebuilt and that took care of everything. Probably could have just gotten away with having it rebalanced but chose to change everything out just to be safe. I kept the old u-joints for spares in case one breaks on the trail.

Originally Posted by van7559
I can bury my pinky in the rear, and just barley feel it, the front is a little easier, but still seems low to me!

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