Rear: 91-01 explorer 31 spline, 95 and later have disc brakes.
I believe they only came with an open carrier or limited slip, upgrade to a true locker would be a good idea,
or search the junkyards and find a jeep dana 44, my unlimited came standard with a 44 with disc brakes. easy drop in alternative
Front: many choices, maybe find a wrecked rubicon and get the 44 out of it. or with a little bit of work a full size dana 44 out of a FSJ, gm, ford, or dodge or you can go bigger it depends on how extreme you would like to get.