10" GM Powerglide Torque Converter 3500-4000 Stall 1962-1973 2 speed PowerGlide, 10.5" bolt circle, 17 spline Welded not Furnace Brazed. Contrary to popular belief, furnace brazing is not the best way to adhere torque converter components to together. Just like a Teflon coated pan, after some time the furnace brazing will erode away and ruin the stators and all other rotating parts in your transmission. Industrial Bearings - No Light Duty Needle Bearings. Needle bearings are good, but not great. Industrial bearings give these converters the ability to handle not hundreds, but thousands of pounds of torque. Thata€s much better then the higher priced alternative converters. Aircraft Aluminum Washers - NO FIBER. Assault converters utilize an aircraft quality aluminum washer instead of those old fiber washers that other companies use. This allows for more horsepower and torque capabilities. NO Automation - ALL HAND BUILT. Assault torque converters are hand built and tested to ensure that you are getting the best converter money can buy. No automated process can ensure that you will get that kind of quality. Made here in the USA.