Detroit DD15 14.8 L Ultra Low Sulfur Diesel 505 hp Engine, 2014 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Detroit DT12-DA-1550 HD 12-Speed Automated Transmission, Differential Lock, 12500 lb Front Axle, 40000 lb Rears, Meritor MT-40-14X Drive Axles, 2.47:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, 72 in High Rise Sleeper Cab, Bunk Beds, Bunk Heater, Aluminum Outer Wheels, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Airliner Air Ride Suspension, 224 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks