Providing it is all stock it will have an AX15 tranny,(medium duty)if late year production, or BA/10 Peugot tranny/wwwthreads_images/icons/frown.gif if early year production. NP231 transfer case. The axles will be D30 up front with disconnect, (vaccume operated) and D35 rear. You can take a look here to get the right ID on the tranny.
Tranny's
GP'n
Tranny's
GP'n