Our 9” Torque Converters are built with a range of stall speeds from 3000 to 4000 RPM stall. They are built in house by us and feature a billet cover made of 4130 steel and Torrington Bearings. They are furnace brazed, have a 4130 steel hub and are balanced to 5 grams. Our 9” converter is designed to handle nitrous and blowers.