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Old 06-16-2013, 05:43 PM   #1
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Driveline vibes while loaded down?

Went for a drive to the beach yesterday and had 2 passengers in the backseat. I had some pretty good vibes when starting from a stop. So I thought I had a ujoint going out. This morning, without them back there, the vibration is gone.

So now I'm thinking it might be one of the forward ujoints or the centering ball? Or whatever it's called.

I have a 4" lift WITH sye and double cardan driveshaft.

Any ideas before I go tearing things apart? It's 102 degrees outside so any little info/ideas will help haha

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Old 06-16-2013, 06:40 PM   #2
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Did you properly adjust the pinion angle with adjustable rear control arms after you installed the SYE?

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Old 06-16-2013, 08:33 PM   #3
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Quote:
Originally Posted by jeepwayoflife View Post
Did you properly adjust the pinion angle with adjustable rear control arms after you installed the SYE?
Yeah it is 1 degree less than the driveshaft angle. I believe driveshaft is at 17 and pinion is at 16.
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Old 06-17-2013, 02:57 AM   #4
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How far down would you say the suspension sags in the rear when the jeep is loaded?
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Old 06-17-2013, 04:54 AM   #5
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I have a transfer case drop on my 4 inch lift and the only time I get bad vibes is when I do this only 100 blocks there and 2k+ in weight
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Old 06-17-2013, 11:37 AM   #6
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I don't think it sagged more than 2 inches. Their combined weight was around 325
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Old 06-17-2013, 03:20 PM   #7
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Just went out and re-checked the angles. I'm at 18 degrees in both driveshaft and pinion in the rear. But up front I'm at 9 degrees on the driveshaft and 6 degrees on the pinion. This wouldn't cause that vibe I'm feeling would it?
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Old 06-17-2013, 03:35 PM   #8
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3 degress difference shouldn't cause anything, but as the back falls the front rises and could make that angle worse. I had vibrations at 4.5 degrees in the back.
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Old 06-17-2013, 03:43 PM   #9
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I noticed my old ranger used to do that and it was the tires in the back. One of them would always go down to about 25 psi. I'd only feel it vibrate w/extra weight.

If its your tires, it would sound a little bit like mild rumble strips w/weight on it. To simulate the load, you could lower each rear tire by about 5 psi and see if it makes the vibration. If so, then go 5 psi up when you have people w/you or for road travel.
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Old 06-17-2013, 04:32 PM   #10
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But it only happens from a dead stop. It's a good enough vibe that I can see my kc's on my front bumper shake. I can barely feel it in my seat though. Then it stops. Then I have a slight vibe/hum at 60+ mph. Still think its the tires? I'll give them a look over anyways. They're set to 27 psi right now

I also just finished checking all of the u-joints. They don't have any play at all. All are solid.

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