The ICON 2.5” suspension system is a great way to lift your 4WD 2011-2016 Ford F-250/F-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, rear leaf spring expansion packs with blocks and U-bolts for a more compliant ride and reduced axle wrap, 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.