Thanks for chiming in, good info for the OP. The "pillow block" is not mentioned by name in the FSM, that I could see. So I'm assuming that is what is refered to as pinion shaft, spacer, gear, and washer, as much as I hate to assume anything working on a rig.The physical third member, is the same between semi and full float. Semi-float gets a pillow block on the cross pin to locate the axle shafts and hold the c-clips in their pockets. Full float shafts are located by the flange getting bolted to the hub, so the pillow block is deleted. Side gears are the same between each variant.