The rears are almost a direct bolt it. A hole in the frame mount and I think in the shackle needs to be enlarged. In my opinion this is a worthwhile effort even if you don't do the front solid axle swap yet. Superduty B codes are what I used. I was amazed that I could move the suspension my standing on the rear bumper. If you do a lot of hauling or towing you may want to explore stiffer springs than the B, but I don't have much information to help you with this. Ask for Junior at atssprings.com