i had read before that there were differences in trannys and transfercases ???? i have a sy tranny and tranfercase with 73k on it (the truck was all original ) and a 93 ty tranny and transfercase with 37k on it (but the engine was modded !!! ) what are the differences ??? they both ran and drove fine and shifted hard (like they're supposed to ) but i want the best to go behind my engine which is the modded one ... and if anybody has it please pm me jwallers phone # i might just have him build one and sell the other ......