Our Performance 2.5 kit for the '11-19 Chevrolet/GMC 2500 HD's takes our leveling kit to the next level. We utilize the same Camburg 1.25" uniball upper arms but combine them with KING's 2.5 series front and rear shocks with compression adjusters. This combination of parts not only improves the ride and handling on-road but more so off-road with the larger diameter shocks and external reservoirs. With the upper arms these shocks increase wheel travel and give you the ability to adjust the factory torsion keys to lift the front end all while improving the ride. Aftermarket torsion keys are not needed and are a waste of. Improved ride both on and off-road Eliminates weak upper ball-joint Increased wheel travel Corrected suspension geometry Made in the USA 0-2" lift Improved ride and handling Increased wheel travel.