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?
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.
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.
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?
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.
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.
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.