Heavy duty transmission parts work simultaneously to provide the right amount of power to your wheels for optimum speed. Without dependable and high-quality transmission parts, you risk losing fuel economy and drivability.Keep your heavy duty truck transmission running at peak performance with high quality transmission parts from FleetPride, including replacement manual and automatic transmissions, transmission bearings, shifters, transmission breathers, transmission gears, manual transmission shift cables, transmission bearing retainers, transmission drain plugs, air module assemblies, oil coolers, isolator bushing kits, valve assemblies, transmission fixes, transmission filter kits, transmission accessories, and more. View our extensive inventory of parts to be Ready for the Road Ahead™.Dorman HD Solutions has a reputation in the heavy duty truck and trailer industry for having a variety of parts for a complete repair. They use advanced reverse-engineering techniques to check into today's common failures and figure out the why. Afterward, they use findings to apply modern technologies to match OEM parts and solve the issues.Based in Colmar, PA, Dorman HD Solutions' roots started in 1918. Dorman HD Solutions’ goal is to provide cost-saving solutions to their customers. They take pride in their ability to reduce technicians' time and owners' money with their innovative products and solutions.