You could do a transfer case lowering kit, which will probably take care of the vibration. (each jeep seems to handle a lift a bit differently) That is the cheap fix. If you don't care about cheap, the best way to go is a Slip Yolk Elimiator, CV Drive shaft, and the right shims on your rear spring mounts to turn the pinion angle up, pointing directly at the yolk output.
Tom Woods is the shaft I went with and they have some tech pages on their site to clarify how the drive line angles should be in both cases (standard shaft with 2 U joints or a CV style double cardan shaft)
[FONT=franklin gothic medium][B][SIZE=2][COLOR=sienna]See, its like my grandaddy use to alway say [I]"When hell is full, the dead will walk the earth[/I]"[/COLOR][/SIZE][/B][/FONT]