You have to weld on the hangers for the front leaf springs, you have to remove your existing engine cross member and put in new motor mounts. You may be lucky like I was and actually have the correct tranny in your truck. You have to also weld in the new shocks mounts as the 4x4 shock mounts are in a different location. It can be done in a weekend if you have all of the parts. The best way to go about it is to get a donor truck so you have all the parts and measurements right there. You can also end up with the right tranny, transfer case and all that you need.