ReadyLIFT 2017 2021 Ford Super Duty Diesel 4WD 2.5" Coil Spring Front ReadyLift 2.5" Coil Spring Front Lift Kit w Bilstein Shocks (Ford Super Coil Spring Lift Kit With Shocks 2.5" ReadyLIFT for Ford SD Diesel 4wd Ford Super Duty Lift Kit 2.5" Coil Spring Front Kit w Falcon 3.3. 2. 5" Coil Spring Front Lift Kit With Bilstein Shocks Allows for up to 35" tall tires. Made in USA. For use on 2017 2021 4WD Ford Super Duty. Diesel Trucks Only NOTE: Super Duty trucks, depending on factory spring rate, may experience a minor variation in lift height. Final lift height may vary from 1. 5" to 2. 5". 35x12. 50. 37 is possible but may require trimming. Tire Size Note: ReadyLIFT wheel and tire fitment recommendations are typically based on Wheel Pros wheels and Nitto tires. Due to product differences among tire manufacturers, tire specifications and dimensions including, but limited to, overall diameter, rolling diameter, tread width, aspect ratio, lug pattern, sidewall construction and inflation pressure, will vary meaningfully by tire and wheel manufacturer. Every tire and wheel combination should be test fit prior to installation. Consult your local installer to learn more about the right tire fitment for your application. Ride Quality Note: When lifting a vehicle and installing aftermarket wheels and tires, a tire manufacturer's construction and material quality can alter vehicle ride quality. When increasing a vehicle wheel and tire size, most larger aftermarket truck and SUV tires are 10 ply (or more) E tires compared to typical OEM 6 ply C tires. This more rigid sidewall construction increases the perception of suspension stiffness often described as ride harshness. The ride, handling, traction, noise, fuel economy, and wear differences between All Season, All Terrain, Mud Terrain, or Trail Terrain type tires can be significant. Please take into account tire and wheel choice will generally have a meaningful impact on the ride & handling experience.