Bulletproof Suspension Inc. has designed a GM 10-12 Inch Lift Kit Suspension System with the best engineering and superior quality Bulletproof Suspension is recognized for. Our Bulletproof Suspension for the GM systems sets the bar for the industry. All components are made from A36 steel plate, 1/4" thick or thicker and heavy wall D.O.M.(drawn over mandrel) seamless steel tubing. We use continuous seam welding and our spindles are of box construction internally gusseted and rosette welded. Our GM kit for it's name sake is Bulletproof.