Cummins ISC 8.3 L Diesel Engine, Air Conditioner, Cruise Control, Engine Brake, Allison Automatic Transmission, Differential Lock, 16000 lb Front Axle, 40000 lb Rears, 56000 lb GVWR, 315/80R22.5 Front Tires, 11R22.5 Rear Tires, Air Ride Suspension, 213 in Wheelbase, PTO, 1989 Trans-Tech 4000 gal Aluminum Tank, 2 Compartments