Ford F250 & F350 Super Duty Parts & Accessories

The Ford Super Duty is the king of the job site, but heavy loads and high mileage eventually take their toll on the factory drivetrain. Whether you use your F250 or F350 to haul a massive 5th wheel, pull a livestock trailer across the state, or tow your toy hauler to the dunes, stock transmissions often become the weak link. Tier One specializes in turning these workhorses into high-performance machines that can tow at the limit without breaking a sweat. We apply the engineering from our race-proven 6R140 and 10R140 builds—fixing common issues like broken input shafts and failed CDF drums—to create drivetrains that stay cool and reliable under pressure. We don't just build them; we drive them, ensuring you get a transmission that handles massive power while staying smooth enough for the daily commute. If your factory transmission is slipping or you are pushing serious horsepower, a stock replacement just won't cut it, so take a look at our Tier One Built Ford Truck Transmissions. If you are looking to upgrade specific components—like high-pressure valve bodies to fix shifts, billet torque converters for towing, or deep pans for cooling—we have everything you need broken down by transmission model. For 2011-2019 trucks, check out our 6R140 Transmission Parts. For 2020-2024 trucks, browse our selection of 10R140 Transmission Parts.