I would get a SYE and a stronger rear driveshaft. (and if I was cracking open the t-case, I'd look into the 6 planetary gear set and wide chain conversions you can do from junkyard parts. not because it's absolutely necessary, but because it's immensely cool and does make the t-case stronger. :D ) then I'd get a locker for the both axles and armor for the undercarriage. having the grip of lockers means less wild tire spinning and more control.