I am going through this on my truck as we speak.... Get a rear Air Lift kit for 2" and 4" lowerd trucks with the wireless controll kit. It will give you a 2000 lbs adition to yur truck and you can keep all your stock leaf springs. It will also take all the wishey washey feeling out of your truck. Sorry if I sound weird I am still feeling the effects of the anistesha.
1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote
List of things to do
4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,