Made out of 3x2x.120" wall mild steel tubing. These mandrel bent frame rails do not have the ugly wrinkles under the bends like other manufactures. Our front crossmember and included driveshaft oval make it easy to assemble the frame as narrow as 18" (outside width). The 4-link is mounted under the frame rails, not on the inside like our competitors. This makes the suspension as wide as possible even with a narrow frame rail width, creating a better handling vehicle. The raised rails over the rear axle allow for lower ride height than rails design to go under the stock floor pans. Designed for our Drag Race Pro 4-link (part nos. 6292 and 6246) and coil-over shocks. Kit includes a pair of frame rails; dropped front crossmember; upper shock mount crossmember; upper shock mount tabs; rear crossmember; 54" long 2x3" subframe connectors; hardware; instructions and drawing. Shipped unassembled by UPS. Rear floor kits made out of aluminum or steel to match our frame rails and factory welding are optionally available.