Are you pulling the tranny/t-case with the engine and swapping it out of truck. Then re-install Engine/tranny/t-case? I believe that to be easier than trying to separate the 2 under the rig.
I would try to to do it on as flat an area as possible. Rolling an loaded engine hoist is more difficult than it should be.
98 uzj100. Factory rear-ARB front locked 4.88's. ARB Bull, Warn 9000, Irbis rear bumper, Slee sliders and belly pan. OME t-bars w/863 rears, HID, XM