I've been contiplating swapping some 52"s in place of my 4" Skyjacker springs. They would ride nicer and flex a lot better.Do you have to move the rear bracket? I was thinking about just running a longer shackle.I already have longer ones on there with my 4" springs. I need my axle moved 1" back for optimum tire fitment.I don't want to trim my new fenders. Next question,anyone ever use 79' Furd f250 rear springs on the rear of a 1st Gen truck? They fit good when turned around in conjunction with a shackle flip.It moves the rear axle back a couple inches and gives some lift.I would imagine they will ride smoother too.