The ICON 2.5” suspension system is a great way to level your 4WD 2005-2016 Ford F250/350 Super Duty while improving ride quality and performance. This entry level system is great for towing, rough construction site terrains, and country dirt roads all while keeping a smooth highway feel. ICON's Stage 1 System is comprised of dual rate coil springs, alignment cams for adding caster, and ICON 2.0 Aluminum Series internal reservoir shocks front and rear. With the endless hours ICON has spent testing and tuning our suspension components and shocks as a complete package, you can rest assured you have the best suspension solution on the market.; For F250 applications, a 4" block can be used in place of your factory 2" block, in turn leveling the truck from front to rear, allowing use of ICON Rear Shocks.