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 56" 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 SKU: 20174.6 - 8 hours1988-1991:4WD:Chevy:C10/K10 Suburban;1988-1991:4WD:Chevy:K5 Blazer;1988-1991:4WD:GMC:C15/K15 Suburban;1988-1991:4WD:GMC:Jimmy