The A-arms differ from 4x4 to 2x4 which means all new mounts would have to be welded to the frame. PLUS the mounts for the axle. PLUS a new transmission/transfer case. PLUS wiring the transfer case. PLUS a stronger rear axle (8.8 swap). I couldnt justify it, personally...I would just sell and buy another one...you can find really decent deals on CL for under $5000 and it would already be 4x4 with a 4.0L