The Ford F-Series Super Duty, starting production in January 1998 for the 1999 model year, includes the F-250 and F-350 pickup trucks and chassis cab, and introduced the F-450 and F-550 chassis cabs. These trucks come in three cab styles: a two-door regular cab, a 2+2 door SuperCab, and a four-door crew cab. The SuperCab features two rear-hinged doors, a design also adopted by the F-150 and Ranger/Mazda B-Series in 1999. Regular cabs have an 8-foot bed, while SuperCab and crew cabs have a 6 3/4-foot bed with an optional 8-foot bed. Chassis cab models offer various bed lengths and wheelbases. Standard models are two-wheel drive with optional four-wheel drive. The F-350 DRW models now offer four-wheel drive. Designed by Andrew Jacobson and Moray Callum, the Super Duty trucks have a unique style, sharing only the taillamp lenses and tailgate design with the F-150. The interior and most of the powertrain components, except the 5.4-liter V8 engine and 4R100 transmission, are distinct. The trucks feature a similar aerodynamic cab design to the F-150 but differ forward of the windshield. The front-end styling resembles the second-generation Dodge Ram but also includes elements from larger Ford trucks like the Ford LTL-9000 and Aeromax, such as a raised hood line, large grille, and low fenders. The side window openings are designed for better visibility and accommodate larger mirrors. Optional manual-telescoping trailer-tow mirrors improve aerodynamics. The trucks also feature two large, ring-style front tow hooks, a first in the industry. In 2002, the Super Duty received a minor update, including a new instrument cluster with a digital odometer, similar to the 1999 F-150's updated cluster.