question on RE 4.5 extrem flex

do you need to install a sye kit and cv drive shaft with this lift kit
I've got a 92' xj, if you have any other suggestions please inform me.
I've been see more death wobble questions when pepole lift more than 3'' so if you direct me away from this it would be appreciated

DW is a front end and Steering thing...

The SYE and DS woul dbe a GREAT way to remove a weak link from your rig regardless of the Vibe issue.

You shouldn't need one with a 4.5" lift, but it would be nice. The issue is vibrations in the rear driveline, so you may need degree shims under your rear leaf springs to set the pinion angle, and hence the u-joint angles, to the correct angle. The top and bottom u-joints on the driveline need to be less than 3* of angle different from each other. The other issue is the length of the driveline, but you're fine at 4.5".