Re: TJ vibes?? SYE and upper or lower adjustable arms???
Assuming that when you get the SYE kit, you're going to get a CV driveshaft, then you're going to want rotate the axle housing up so the pinion is pointing to the back of the t-case. The way I figure it, you can do that by either shortening the lower arms or lengthening the upper arms. I'm not not sure which would be better, my kit had adjustable upper arms. I guess maybe the uppers might be cheaper for you since they're a little smaller. Also keep in mind...On mine TJ, rotating the axle like that pushed the track bar back into the front of the gas tank skid plate, so I had to beat the skid plate with a sledge to make it agree with my intentions. Also, when you rotate the housing like that you have to mount the rear shocks upside down because the lower coil spring pad rotates back into the shock tube. I guess if you have a guy who can cut and weld good and cheap, you can have him cut enough out of upper arms to get the right pinion angle, but that might involve a little trig to plan, and some luck.
Good luck man, with the cv shaft, all your vibe problems should go away.