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Old 02-13-2014, 07:23 PM   #1
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Vibration

I put the express super flex lift with adjustable upper and slip yoke eliminator. Had a vibration so I adjusted the rear uppers now vibration is coming from the front. Adjusted the front to no avail. Aligned the front end now it's darty. If I go anymore on the front there is no way I'm going to get caster close. Front shaft is stock and vibration is from 25 mph and up under load, as soon as I push clutch in its gone. Any suggestions?

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Old 02-13-2014, 07:41 PM   #2
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Take some pictures and post them of your pinion angles. How high is the lift? Do the vibes go away if you disconnect your front drive shaft?

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Old 02-13-2014, 08:11 PM   #3
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It's a 31/2 lift on 35's
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Old 02-13-2014, 08:39 PM   #4
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Have you tried disconnecting your front drive shaft at the axle and tying it up out of the way and driving it? How do you know it's coming from the front? Your front drive shaft is much longer than the back and normally a lot more forgiving. Your angles don't look bad to me.

What brand is that sye? That's the only one I've ever seen that puts the yoke that far back from the case.
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Old 02-13-2014, 08:52 PM   #5
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I think it's rugged ridge. I have not unhooked te front shaft. Before adjusting the rear uppers vibration was towards the back, now it's in the steering whelel.
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Old 02-13-2014, 08:57 PM   #6
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Quote:
Originally Posted by dknee928 View Post
I think it's rugged ridge. I have not unhooked te front shaft. Before adjusting the rear uppers vibration was towards the back, now it's in the steering whelel.
If it's in the steering wheel, it's most likely not a drive line vibe. Wheel balance or alignment. Did you reset your toe-in after you did the lift? I would adjust your front pinion angle back down some to get some caster back, and look elsewhere for the vibe.
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Old 02-13-2014, 09:03 PM   #7
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When I push clutch in while driving the vibe dissapears.
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Old 02-13-2014, 09:10 PM   #8
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Originally Posted by dknee928 View Post
When I push clutch in while driving the vibe dissapears.
Your front drive shaft is being driven by the axle pinion in the front (in 2wd) whether the clutch is in or not. I would disconnect the front ds and drive it to see if the vibe goes away.
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Old 02-13-2014, 09:56 PM   #9
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If that cures it then what?
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Old 02-13-2014, 10:06 PM   #10
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Replace u joints. Possibly cv joint but most likely u joints. Can pull rear and drive in 4wd basically fwd and test it to. Good luck.
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Old 02-14-2014, 11:01 PM   #11
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Took out front shaft no change. Spent all day adjusting the rear uppers. Vibration went away after putting a 1 inch Tc drop.
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Old 02-14-2014, 11:51 PM   #12
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Thanks for the update! I would like to think playing with those uppers can get rid of the tcase drop. At least I hope to when I get a SYE. I would play with them some more when you got some free time.

Make pinion point at the t case with drop removed.
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Old 02-15-2014, 08:45 AM   #13
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Quote:
Originally Posted by dknee928 View Post
Took out front shaft no change. Spent all day adjusting the rear uppers. Vibration went away after putting a 1 inch Tc drop.
The whole point of a sye and DC drive shaft is so you don't need a tcase drop.
Did you measure angles of rear drive shaft and pinion when doing the adjustments?
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Old 02-15-2014, 11:52 AM   #14
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Originally Posted by Shark_13 View Post
The whole point of a sye and DC drive shaft is so you don't need a tcase drop.
Did you measure angles of rear drive shaft and pinion when doing the adjustments?
^^This^^

Just FWIW, in the past year, I've seen two different posters on the Forum that had run out issues with the SYE's they bought. That is most likely not your problem if the vibes went away by dropping the tc, but it is something to think about, and easy to check.
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Old 02-24-2014, 05:55 PM   #15
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Well I have tried everything. The vibs are not that bad but they are there. I exchanged the d/s for another one with no changes in the vib. It must be in the SYE. I have tried every pinion angle from -5 to +15
I did the lift, SYE, tires and wheels all at the same time.
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Old 02-25-2014, 09:25 AM   #16
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I just went through this. Check the front for worn parts. I found that I have a bad unit bearing on the passengers side. I could not feel any play in the joint when testing, but found grease starting to come out when I removed it. Now it feels like driving a stock jeep again. Also swap tires and wheels with a buddy and see if the vibe goes away. Did they do a road force balance on the tires when you got them installed? If not you need one.
I know it not much but its a start.

Good luck

Mel

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