The TRW JCS1561T Front Coil Spring Set is engineered to meet original equipment (OE) specifications for the Ford F-150 models from 2004 to 2018. Designed to provide a constant rate for original performance, these coil springs ensure consistent handling and stability under varying load conditions. Manufactured with premium materials, they undergo magnetic particle inspection to guarantee structural integrity and durability. The powder-coated finish offers enhanced corrosion resistance, extending the lifespan of the springs and maintaining their appearance over time. TRW's rigorous testing process includes four levels of technical and audit reviews, with endurance testing of 500,000 cycles, ensuring that each part meets high-quality standards. This comprehensive testing process ensures that the TRW JCS1561T Front Coil Spring Set delivers reliable performance and durability, making it a valuable component for maintaining the optimal handling and stability of Ford F-150 vehicles.