Cat C7 Ultra Low Sulfur Diesel Engine, US EPA Label, Air Conditioner, Cruise Control, Allison Automatic Transmission, 10000 lb Front Axle, 20000 lb Rears, 5.29:1 Axle Ratio, 30000 lb GVWR, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Spring Suspension, 148 in Wheelbase