x3
When I got my Skid I called Dirk at DPG because he sold me my lift and he told me to get the JCR because he wasn't making his anymore and theirs looked to be designed very similar to his.
It has worked out great for me the only problem I had is I screwed up one of the nutserts on install so one side is short a bolt..
I may drill through the unibody rail and put a through bolt someday but it has been used as is and works great.
I did a 4.5" lift and did the wait and see method on whether or not I would have driveline vibes before I did a s.y.e.
I had no vibes and I even have a late model which had a rep for getting them easier after a lift.
as far as tcase drops I wouldn't want to give up the belly clearance or put any undue stress on the motor mounts (not sure if that's actually an issue).
A few years later I replaced the Original dshaft joints and did the Iron Rock Offroad hack n tap s.y.e. with stock front Dshaft for the rear and some degree shims for the axle.
It was cheap and pretty easy to do, I figured I would get longer life with better angles.
It worked well besides coming loose once but maybe I should have used more loctite or re torqued sometime.
After the front output on my np231 went bad I got a Jb conversions built np231 with Full H.D. sye and never have to worry about it coming loose again.
I wouldn't be suprised if you didn't need the drop at all..
If your drive line angles are causing vibes then I'd recommend a S.y.e
Hack and taps are cheap and pretty easy and there are some pretty affordable Full H.D. ones as well and good walkthroughs on here of installs.
Good Luck!