Paccar PX-8 6 Cylinder 8.3 L Diesel Engine, 6747 Engine hrs, Engine Brake, Allison Automatic Transmission, 11997 lb Front Axle, 22994 lb Rears, Dana S23-190 Drive Axles, 5.25:1 Axle Ratio, 34991 lb GVWR, 11R22.5, Air Ride Suspension, 237 in Wheelbase, 20 ft x 102 in Wide x 89 in High Body