Find Components for your CHALLENGER MT645D 175 HP to 299 HP Tractors. Explore new and used CHALLENGER MT645D 175 HP to 299 HP Tractors for sale near you on TruckWorld! Can't find the exact CHALLENGER MT645D 175 HP to 299 HP Tractors you need? Post a free Want-To-Buy and get notified when it's available. With shipping, advertising options available, TruckWorld is your one-stop site for all of your CHALLENGER MT645D Tractors needs.