Paccar PX-6 6 Cylinder 6.7 L Diesel 280 hp Engine, 2011 US EPA Label, Allison 2500 Automatic Transmission, 12347 lb Front Axle, 20994 lb Rears, Dana P22060S Drive Axles, 5.57:1 Axle Ratio, 33341.0 lb GVWR, Air Ride Cab, 11R22.5, Hendrickson Air Ride Suspension, 260 in Wheelbase, TK 24 ft x 102 in Wide x 94 in High Body, Liftgate