Mock up was fairly simple, the front of the kit mounts in the stock holes.but i'm going to move it back 2". I ran into 2 issues and hope they are relatively small. 1) the kit fits 3" rear ends and I have a f--d 8.8 which is 3.25. should not be that big of an issue. 2) the 4link and the rear mount 19 gallon tk. made for a tight fit especially wanting to move it back 2". so i loosened the rear crossmember and moved it back. i'll get some picks up this weekend maybe?