Detroit DD15 14.8 L Ultra Low Sulfur Diesel Engine, 2014 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Detroit Automated Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, Meritor Drive Axles, 2.47:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, High Rise Sleeper Cab, Bunk Beds, Aluminum Wheels, 275/80R22.5 Front Tires, 445/50R22.5 Super Singles Rear Tires, Airliner 4-Bag Air Ride Suspension, 254 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks