100% bolt-on installation Equipped with durable Clevite Rubber Bushings for maximum vibration absorption. Help maintain factory angles when used with 4-6in lift kits. Includes adjustable alignment cam at the axle to allow caster adjustment Sold as a pairONLY works on models equipped with 4-6in suspension lift. Not compatible with radius arm drop brackets. Drop brackets must be removed.3-4 hours2005-2016:4WD:Ford:F-250 Super Duty;2005-2016:4WD:Ford:F-350 Super Duty