We have bundled everything you need in this lift kit for your F-250/F-350 4WD with high quality Cognito components and Fox shocks. There is no guesswork.The Cognito 3-inch dual rate coil springs offer the ride height you want without sacrificing ride quality. These springs feature a progressive spring rate to achieve optimal ride quality.The 2.0 Performance Series IFP smooth body shocks contain the latest in shock technology to transform the performance of your truck. They use Fox race-proven damping control to provide a comfortable on-road ride and predictable off-road handling in even the toughest conditions. Made in the USA.