All the same chassis and engine all the way back to the first one in '78. The first of those kits, which was 2 wheel drive shares most of the parts too. Kris, if you had a copy of the 2 wheel drive front suspension it could be used directly on the 4X4 frame. BTW, I offered the front suspension from my unbuilt example to a couple people for casting years ago in exchange for a couple copys for myself and there were no takers.