Yes, Firestone air spring kit 2071 will work on a 2003 Ford F-350 dually as long as you have 7.50 inches of clearance between the tire and frame. If you tow a 5th wheel or gooseneck trailer, you will need to use Firestone Air Spring kit 2550. Firestone kit 2071 will not work with a fifth wheel or gooseneck trailer hitch. Thank you!