Detroit Series 60 6 Cylinder Diesel 400 hp Engine, US EPA Label, Engine Brake, Allison HT-740 Automatic Transmission, Rockwell RT-52-160P Drive Axles, 4.89:1 Axle Ratio, 68000 lb GVWR, 315/80R22.5, Double Frame, Hendrickson Spring over Walking Beam Suspension, 175 in Wheelbase, PTO, Wet Kit, Dual Fuel Tanks, Manual Sliding Fifth Wheel