Timbren SES kits are designed to work on vehicles with factory ride height, allowing for a 1 inch space between the Aeon® rubber spring and your vehicle’s suspension when unloaded. But if you have a leveling kit, body lift, or full suspension lift, the increased distance can reduce the performance of our SES kits. However, there is a way you can still enjoy a level, controlled towing experience with your lifted truck. Our Timbren SES spacer kits reduce the gap between the Aeon® rubber spring of our SES kit and the increased distance between your lifted pickup’s frame and rear axle — enabling your Timbren SES kit to perform properly.