what are the center pin location compares to the 56ers? i want 4" of lift and softer springs than my 4"skyjackers on my long bed. what would i have to do to achive 4" of lift with stock 63" besides moving the spring mounts an adding a shackle flip? would i need a longer shackle? zero rate? i have searched many many 63" springs posts and they dont mention how much lift they are getting with them. if i want the soft 57 furd springs whould i have to relocate the springs mounts to retain stock centerpin location? do they have overload springs? basically my goal is to have soft springs and good shocks for a pleasant ride on and off road. my 3/4 lift springs arent cutting it, they are way to stiff....thanks in advance.