Kryptonite Upper Control arms are made from laser cut steel, then machine formed and precision welded for ultimate strength. Our control arms are built with pride here in small town USA and backed with a lifetime warranty. Kryptonite UCA kits will improve the ride of any leveled or lifted GM 2500-3500 HD truck. Also a great upgrade for your stock height truck. Kryptonite UCA's are compatible with any stock or leveled 2500-3500 HD and most suspension lift kits.