Pro Series Stage III Billet Multi Disk Torque Converter For the GM 4L60E LS Style Transmission Converter Diameter - 258mm - 10 1/4" Available in stall speeds from 2500-3500 rpm 100 Square inches of Clutch Lining for WOT Lock-Up Furnace Brazed Hand TIG Welded Turbine Hub Torrington Bearings Billet front and Billet Piston Deep Groove Ball Bearing Design for Longer Clutch Life Flanged Impeller Hub for Anti-Flex Durability Hand Assembled to Exacting Tolerances