Increased ground clearance Includes application valved N3 series shock absorbers which offer the best in balanced performance for on and off-road use.ONLY fits models with 52" rear leaf springs. If vehicle is equipped with a front sway-bar, drop brackets are recommended. (SKU: 1019) If vehicle is equipped with factory front quad shocks (4 total front shocks), please add Factory Quad Shock kit below (SKU: Q20027).6 - 8 hours1973-1976:4WD:Chevy:C20/K20 Pickup;1973-1976:4WD:Chevy:C20/K20 Suburban;1973-1976:4WD:GMC:C25/K25 Pickup;1973-1976:4WD:GMC:C25/K25 Suburban