i have the 5.5 progressive rates as well.. i was way low in the front (2") and im thinking its due to the weight of my front bumper (400 LB) so i simply went to a guy i know and had him cut me some 1 1/2" steel spacers to get it right.. the springs imo from james duff absolutely suck for wheeling, im not looking for ride quality cause i barely drive it on the road, i just want something thats gonna give me the lift i need.. and i actually compared my old 4" skyjacker with the new 5.5" duff spring and the uncompressed length difference was only 3/4".. point is, if u have a heavy bumper and wanna go real high like me (7" suspension, 3" body) u might wanna find spacers or look at an alternative spring