Detroit DD13 450 HP. 13 Speed, 3:36 Rears,Air-ride Steer axle, light weight spec, aluminum 5th wheel, wide base singles, 17540lbs. 1/2 full of fuel. 40" high-roof stratosphere sleeper, ali-arc bumper, xm radio, webasto block/bunk heater, 260,000 miles. Not a Peterbilt, Kenworth, or Freightliner