Detroit DD13 12.8 L 450 hp Engine, Allison 4500 Automated Transmission, 20000 lb Front Axle, 46000 lb Rears, Meritor RT-46-160 Drive Axles, 4.30:1 Axle Ratio, Aluminum Outer Wheels, 425/65R22.5 Front Tires, 11R22.5 Rear Tires, Air Lift Tag Axle, Double Frame, Hendrickson Haulmaax Suspension, 231 in Wheelbase, PTO, OX Bodies 16 ft Long Body, 20 cyd, Capacity, Electric Roll Tarp