I have a different point of view for consideration.. The sag, ride height, preload or what ever word you use to ultimately describe where your shock chrome shaft is within its stroke. Should be set with am idea of what type of riding you plan on doing... Sand dunes, rock crawling, trail riding.. For example sand dunes you may choose to run 70/30 70 percent of the chrome shaft is showing 30 percent is up into the shock body.. This will allow 30 percent of down travel and 70 per compression travel.. 50/50 for rock crawling.... etc. SO that said extend your shocks full extension, measure bumpstop to shock body (chrome exposed) do the math.. make a mark with a sharpie. Fill your rig with full gas and all you normally carry, if you want to get really into it add sand bags to the drivers seat and passenger seats to act as you and your avg. passenger weight . Than move the preload up and down to have the sharpie mark just entering the shock.... Than you will have the unit set.. There is more messing around but this will allow proper settings to than make determinations if spring and valving are needed... That help?