These coil-overs are valved specifically for the new body style (GMT 900 Platform) Chevrolet and GMC half ton, 2WD and 4WD applications. They not only drastically improve the off road characteristics of the vehicle, but increase the on road handling and performance as well. These shocks add an additional inch of wheel travel when used in conjunction with an ICON Vehicle Dynamics Arm (PT# 78600). They also offer an additional amount of lift height compared to our standard travel coil-over shocks.