Cummins ISB 6 Cylinder 6.7 L Diesel 325 hp Engine, 2010 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Eaton Fuller EH-8EX06A-T Automated Transmission, 12000 lb Front Axle, 21000 lb Rears, Meritor RS-23-160 Drive Axles, 5.63:1 Axle Ratio, 33000.0 lb GVWR, Air Ride Cab, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Airliner Air Ride Suspension, 160 in Wheelbase