I went the orther route with my 55.I put in an M2 frontend with power rack and pinion steering.Man what a difference,it sits down there where it looks mean and sassy,and rides and handles like a dsream.At firest in the rear I took out 4 leaves on each side and got it lowered like I wanted it,this also produced a better ride.Later I bought a complete new 5 leaf setup from TCI and installed it.This meant flipping the rear,and installing new spring mounts,shackles,and springs.Also new shock mounts,shocks and a sway bar.It definitly rides and handles 100%better than the old stock setup.If you want to keep it all stock this aint the way to go,but in the long run you will have a truck that is a joy to drive.Just my opinion on the subject,of course I am an old hotrodder at heart.