100% bolt-on installation Control arm drop brackets allow for properly set caster. Proper caster is crucial to maintaining factory handling and driveability.ONLY works on models equipped with 6-8in suspension lift.4-6 hourshttps://s3.amazonaws.com/roughcountry/install/92595000.pdf2005-2015:4WD:Ford:F-250 Super Duty;2005-2015:4WD:Ford:F-350 Super Duty