C15 Caterpillar Engine 475 hp; 774,159 mi; Diesel; 18 Spd OD; Engine Brake; Air Ride Suspension; 3.36 Ratio; 24.5 Tires; Aluminum Outside Wheels; 272 in Wheelbase; Tandem Axle; 12,000 lb Front Axle Weight; 40,000 lb Rear Axle Weight; , Full Gauge Pkg,Drive Tire Virgin 75%,Steer Tires 65%,Brake 80%, 18 Speed OD, Will build to your Spec's