Allows the leaf spring system to function more effectively.
In either situation, you'll feel the difference in positive handling and control Rear Leaf Spring Bushing Set;w/ Molded-In Frame Shackle Bushings;Black;California Residents: WARNING Energy Suspension Rear Leaf Spring Bushing Set (Black) - 4. For high-performance applications, the combination of heavy duty/performance leaf springs and ENERGYs polyurethane spring bushings deliver maximum benefit.2144G These bushings also improve lighter-duty leaf spring systems, adding a higher degree of performance and durability..