I have shackles and hangers in the rear of my truck for a 4" drop and I think it sucks. I am having to add an air lift kit just to comp for how much the lowering kit made the springs weak. Every time I hit a bump it bottoms out. I have all new springs with edelbrock IAS shocks, and no differance. On my old truck I had stock shaclkes and hangers with hotchkis 4" drop leaf springs, and I had no problems what so ever.... Just my .02 cents
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,