The tcase you have from a 94, if it was bolted to a 5spd is a 231. It will bolt to the auto trans, the question comes into play is if the input shaft is long enough, they came in 3 lengths, there is a lot of info out there on which ones were supposed to be on which trans/tcase combo. input shafts are easy to swap and get. 3 lengths, 2 different gear cuts, and the change in gear cut came in 94.

when i said viscous coupling, i was assuming your jeep has a 249 tcase (full time, no 2wd option) I think all the 5.9 jeeps were.

In order to swap t cases, you might need different driveshafts, there are driveshaft length charts out there, google (jeep driveshaft length chart)

5.9L jeeps came with 3.73, tire size stock i think was 225/70R16