Allison Automatic Transmission, 13220 lb Front Axle, 40000 lb Rears, 77220 lb GVWR, Air Ride Cab, Aluminum Front Wheels, 315/80R22.5 Front Tires, 305/70R 22.5 Rear Tires, Air Lift Pusher Axle, Air Lift Tag Axle, Dual Steering Boxes, Double Frame, 267 in Wheelbase, PTO