I read through some of the tech know how lists. its kinda cool. incase you have no idea what im talking about Here's the Link
Anyways. in there they tell you how to swap out your coils for F150 ones. Much more stiff and alot less sag. anyways. i dont know how long pro comps coils are for 5" lifts nor what there designed to settle at and still achieve the lift. OR the same for F 150 Coils. point is. my truck isnt a stock lift truck. so i need to know what a 5" lift ranger coil would equal from an F150. aftermarket or not. i like the idea of stiffer spring rates.