The Ford Super Duty (short for F-Series Super Duty) is a series of heavy-duty pickup trucks produced by the Ford Motor Company since the 1999 model year. Slotted above the consumer-oriented Ford F-150, the Super Duty trucks are an expansion of the Ford F-Series range, from the F-250 to the F-550. Rather than adapting lighter-duty trucks for heavier use, Super Duty trucks have been designed as a dedicated variant of the Ford F-Series, including pickup trucks and chassis-cab vehicles; the Ford F-450 is the largest pickup truck offered for sale in North America. Currently in their fourth generation, Super Duty trucks use a separate chassis from the F-150, including heavier-duty frame and chassis components, which allows for heavier payloads and towing capabilities. With a GVWR over 8,500 lb (3,900 kg), Super Duty pickups are Class 2 and 3 trucks; chassis cab trucks are offered in Class 4 and 5 sizes. The model line also offers Ford PowerStroke V8 diesel engines as an option. Alongside pickup trucks and chassis cabs, the Super Duty line includes medium-duty F-Series trucks (F-650 and F-750); the Super Duty pickup truck also served as the basis for the Ford Excursion full-sized SUV. Ford F-250 to F-550 Super Duty trucks are assembled at the Kentucky Truck Plant in Louisville, Kentucky, while medium-duty F-650 and F-750s are assembled at Ohio Assembly in Avon Lake, Ohio. Prior to 2016, medium-duty trucks were assembled in Mexico under the Blue Diamond Truck joint venture with Navistar International.
