when I bui8lt that truck I used the caddy hanger center to center from the stock hanger is 7 1/8 but that was because I moved the rear an inch forward for him. they stuff much nicer than before we put the chevy springs in the pack. as installed b4 the chevys they were too soft and ate the inner fender. so we put the chevies in and now it reacts much better, at the same time I put a 91 axle in the rear to take care of any rubbing issues. the shocks are rancho0 5012. the truck has skyjacker 5 in. springs in the front, and as of now it sits level, with 2 in. longer shackels in the front.