The TRW JCS1477T Rear Coil Spring Set is engineered to restore the suspension system of Toyota Sienna models from 2004 to 2010, ensuring optimal ride quality and vehicle stability. Designed to meet original equipment (OE) specifications, these coil springs provide a constant rate for original performance and allow for installation to the chassis the same way as the OEM. They undergo magnetic particle inspection for controlled metallurgical processes, ensuring durability and reliability. The powder-coated finish offers maximum corrosion resistance and improved appearance, making them a dependable choice for fleet operations seeking to maintain vehicle performance and safety.