As to Drew's comment, the issue of CV or non-CV driveshaft has nothing to do with the transfer case. The Rubicon 241OR has a short-shaft, fixed yoke output, and that's what we like to see.
Presence or absence of a CV joint (actually a double cardan joint, which despite the fact that it's often referred to as a CV joint, isn't really) does not create vibrations. A u-joint is designed to operate with a certain range of angularity. As the angularity ibcreases, the life of the u-joint decreases. At a certain point, the angle axceeds the ability of the u-joint to cope.
That's when you go to a double cardan joint. Since it comprises two u-joints within a single assembly, it can run at (theoretically) twice the angularity of a single u-joint.
That is the ONLY real reason to run a double cardan joint. For moderate lifts where the single u-joint angularity is not exceeded, I see absolutely no point to adding the weight and complexity of a double cardan, coupled with the need to then shim the rear axle to make the rear u-joint angle as close to zero as possible.
I will be installing a JB Conversions SYE on my 2000 5-speed, which has Up Country but no lift. I'm doing it only to enhance durability and to eliminate vibes, not because of any lift. I will use a driveshaft with a conventional yoke on each end and a slip joint in the shaft, no double cardan. I expect that setup to perform well and to be a huge improvement over the stock setup.
