Cummins ISL G 320 6 Cylinder 8.9 L Liquefied Natural Gas (LNG) 320 hp Engine, 2010 US EPA Label, Air Conditioner, Cruise Control, Power Windows, Allison 3000 Automatic Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, Meritor RT-40-145 Drive Axles, 6.14:1 Axle Ratio, 52000.0 lb GVWR, Air Ride Cab, 34 in Flat Top Sleeper Cab, 295/75R22.5, Airliner Air Ride Suspension, 224 in Wheelbase, Air Sliding 5th Wheel