Paccar PX-8 6 Cylinder Ultra Low Sulfur Diesel Engine, Eaton Fuller 6-Speed Manual Transmission, 12000 lb Front Axle, 21000 lb Rears, Dana p220605 Drive Axles, 3.70:1 Axle Ratio, 33000 lb GVWR, 295/75R22.5, Air Ride Suspension, Marion 28 ft x 102 in Wide x 103 in High Body, Liftgate