Cummins X15 6 Cylinder 15.0 L Diesel 450 hp Engine, 2019 US EPA Label, Requires Diesel Exhaust Fluid, Engine Brake, Eaton Fuller 12-Speed Automated Transmission, 13200 lb Front Axle, 40000 lb Rears, 3.08:1 Axle Ratio, 51200.0 lb GVWR, Air Ride Cab, 72 in High Rise Sleeper Cab, Aluminum Wheels, 295/75R22.5, Air Ride Suspension, 247 in Wheelbase, Dual Fuel Tanks