Allows the leaf spring system to function more effectively.
.Be in control - when maneuvering through turns, during standing start accelerations, braking, and over bumps and berms. In either situation, you'll feel the difference in positive handling and control 99-04 Ford F-250/F-350 Super Duty;00-04 Ford Excursion;4WD models;Front leaf spring bushing set;Black;Made of superior hyper-flex material;Adds dramatic amount of performance/durability;Helps vehicle be in control;Allows the suspension to function properly;Includes all necessary bushings and sleeves for left and right side;California Residents: WARNING Energy Suspension Front Leaf Spring Bushing Set (Black) - 4.2148G These bushings also improve lighter-duty leaf spring systems, adding a higher degree of performance and durability.