When you need those hard-to-find parts for your truck, check with the area's leading truck parts store first! Rocky Mountain Medium Duty Truck Parts features parts for all trucks and offers the kind of service that makes repeat customers out of everyone. Rocky Mountain Truck Parts has used medium duty truck parts including Cummins, Isuzu and Caterpillar engines; Fuller and Spicer transmissions; suspensions; tires; wheels; Isuzu, Ford and GMC cabs; hoods, and Eaton and Spicer rear ends. We stock an enormous quantity of parts specifically for medium duty. Rocky Mountain Medium Duty Truck Parts makes sure we have the parts to keep your trucks on the road! If we don't have the part you need, we will search nationwide to find it for you.