The LESJOFORS 4492522 Rear Coil Spring is engineered to provide superior support and stability for the rear suspension of the Toyota Sienna. Manufactured by LESJOFORS, a company with a legacy dating back to 1675, this coil spring is designed to meet or exceed original equipment (OE) specifications, ensuring a precise fit and reliable performance. Constructed from high-strength steel, the spring undergoes a comprehensive manufacturing process that includes heat treatment, shot peening, and a multi-layer coating system comprising zinc phosphate and epoxy powder coating. These processes enhance the spring's durability and resistance to corrosion, making it well-suited for various driving conditions. The pre-setting process ensures optimal performance and eliminates settling, maintaining consistent ride height and handling characteristics. By choosing the LESJOFORS 4492522 Rear Coil Spring, fleet operators can expect improved vehicle handling, reduced maintenance costs, and extended service life, contributing to the overall efficiency and reliability of their operations.