Detroit Speed's front frame is a bolt-in replacement for the original stock subframe. It improves the handling and ride quality by utilizing Detroit Speed's unique suspension geometry. It is the ONLY Chevy II frame in the aftermarket industry with OEM quality stamped crossmembers for improved structural rigidity. The bay bars feature rigid integral hood hinge mounting and are hidden when used with Detroit Speed's Chevy II Inner Fenders package. Spring Rate: 400 lbs/in Spring Free Length: 10 in Single Adjustable Shock:Includes all features of base shock with 'Detroit Tuned' valving plus installed rebound adjustment with the simple turn of a knob while providing excellent ride quality on the street. SBC and LS engines have been designed as a direct bolt-in to this frame. The Detroit Speed frame has been designed, engineered, and developed for the road and track. This frame blends the benefits of current OEM technology and aftermarket performance into one product! The frame is sold in bare metal, uncoated and unassembled. If the powder coat option is purchased, assembly is included.