Cummins ISB170 4 Cylinder 3.9 L Diesel 170 hp Engine, 2004 US EPA Label, Automatic Transmission, 4500 lb Front Axle, 7900 lb Rears, 10000 lb GVWR, 225/70R19.5 Front Tires, 225/70R19.5 Rear Tires, Spring Suspension, 178 in Wheelbase, Utilimaster 18 ft 4 in Long x 94 in Wide x 84 in High Body