Keep your ride smooth and your load level with the Timbren GMRCK25D Rear Suspension Enhancement System. Easy to install in under 30 minutes, this Timbren SES kit requires zero post-installation maintenance. But should any defects in material or workmanship occur, it is backed by a lifetime warranty! The Aeon® rubber springs leave a 1/2" to 1 1/2" gap between the springs and vehicle, eliminating any squat, sway or roll as the load in your vehicle increases. Tow or haul more comfortably with the Timbren Rear Suspension Enhancement Kit.