The BD 6R140 ProForce 4D Torque Converter is designed for hard-working and modified 6.7L PowerStroke Diesels. This torque converter is equipped with 4 clutch surfaces designed to handle heavy towing loads and is intended for up to 900+ horsepower. Our in-house CNC machined forged cover is designed to prevent warping and improper balance while facilitating the increased clutch count without sacrificing strength. In addition to a new cover, BD has designed a custom piston, bearing hub, release springs and backing plate to retain the OEM captured clutch design which delivers the same great drivability 6R140 owners are accustomed to.