Ram Truck Parts & Accessories

Your Ram truck was built to work, whether that means hauling a trailer full of livestock, towing the family boat for a weekend getaway, or dragging a heavy toy hauler to the race track. But heavy loads kill stock transmissions. At Tier One, we specialize in building high-performance drivetrains that are battle-tested on the track and proven on the street. We don't just build these transmissions; our team daily drives the very same models we work on, ensuring that our builds offer the perfect balance of race-winning durability and comfortable daily drivability. We take the data from our 1000HP+ race trucks and our daily commutes to engineer transmissions that stay cool and reliable, even when pulling max GVWR up a steep grade. Whether you drive a Ram 1500 or a heavy-duty Ram 2500/3500, we have the built transmissions, rebuild kits, and performance parts to ensure you get to your destination without worry. Make sure to also check out our built 68RFE transmissions, built AS69RC transmissions, or our built 48RE transmissions.