New clutch setup, throwout bearing, seals are good to handle as well as rear main seal while at it, your 96 trans i wanna say has a bigger tip input shaft so will need to run a bushing as your 88 crank on the 4.0 will be big enough. Keep the tcase with the 96 if can. Also need an crossmember for Ax-15 as well, unless you want to fab π
They are some good write ups to be found on this same swap. Write out a list and check as you go. Welcome to the club.