Mercedes-Benz 12.8 L 450 hp Engine, US EPA Label, Engine Brake, Eaton Fuller 13-Speed Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, Air Ride Cab, 60 in Sleeper Cab, Aluminum Wheels, 11R24.5, Airliner Air Ride Suspension, 227 in Wheelbase