Quality used diesel engines and heavy truck parts. Cummins, Detroit, CAT, International, Isuzu, Volvo, Mack. ISX, DD15 and C15 Engines. Nationwide Truck Parts LLC. sells quality used heavy truck parts, used diesel engines, transmissions and more. We provide quality used heavy truck parts at a reasonable price. Every part we sell comes with a standard warranty and is tested prior to sale. We ship nationwide with same day shipping available. If you do not see the part you are in need of, give us a call as our inventory changes daily and we can locate any part you need.