The 4L80E Triple-Disc Bolt-Together Torque Converter is designed for durability DIY service and stall speed changes. There’s no need to ship it back to TCI no welding and no cutting required. Inside is a triple-disc lock-up clutch with the latest generation carbon friction material with significantly higher torque capacity than commonly found in other aftermarket converters – more than 1 000 HP. CNC-billet construction provides increased strength over traditional stamped steel converters while a furnace-brazed impeller and turbine and tig-brazed turbine fins add to durability.; A high-performance replacement for OEM cast iron versions the TH400 Billet Valve Bodies feature re-routed passages that are simplified shorter and highly radiused for improved transmission fluid flow efficiency and shift speed as well as building pressure more quickly than competitors. The machined billet aluminum construction offers weight savings without compromising strength while hardcoat anodizing increases valve bore wear resistance and provides a clean finished appearance.