Detroit DD15 6 Cylinder 14.8 L Ultra Low Sulfur Diesel 455 hp Engine, 2018 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Detroit DT12-1650-OH1 12-Speed Automated Transmission, 12000 lb Front Axle, 40000 lb Rears, Meritor MT-40-14X Drive Axles, 3.08:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, 72 in Condo Sleeper Cab, Bunk Beds, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Airliner Air Ride Suspension, 228 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks