Download Core Refund Information – Steering Gear: A rebuildable core will have no excessive wear. No disassembled units. No worn, broken, scored, damaged, cracked, frozen or rusted housings. No broken or damaged mounting points. If it does not meet the above standards, it is not rebuildable and will not be refunded. DO NOT send a non-rebuildable core. Timbren Spring Assist Kits are designed to work with existing suspensions to improve a truck’s ride while protecting against overloading, road shocks, bottoming out, sway bar and spring failure. The hollow rubber springs do not affect an empty ride, but will progressively compress as a load is applied. • Rubber springs absorb road shocks and adjust to uneven loads or road conditions. • Controls body roll during cornering with powerful progressive rate rubber springs which resist lean and enhance vehicle roll stability. • Improves ride quality and handling performance when carrying heavy loads or pulling a trailer. • No holes to drill; no air lines to route; and no fittings to leak. Easy installation with basic hand tools. Simply install the rubber springs in place of factory rear bump stops. • Includes powder-coated brackets, mounting hardware and instructions. • Maintenance-free and backed by a lifetime warranty.