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Automatic transmissions can deliver amazing circle track racing performance if equipped with the properly tuned torque converters. The TCI 10-Inch FastLap Torque Converter for GM Powerglide Transmissions provides the best of all benefits, including great acceleration when you need it. Utilizing an extremely low stall speed, this torque converter also provides more engine braking going into the corners and faster acceleration coming out of the turns. Now available in a 10-inch diameter for decreased rotating mass, the FastLap Powerglide Torque Converter is the ideal solution for racers looking for better performance at a reasonable price.Combining 35+ years of torque converter technology and on-track testing, the engineers at TCI selected the optimum stall speed for dirt and pavement circle track competition. This reduced stall speed torque converter incorporates heavy-duty oversized bearings for increased load capacity and less drag to deliver a product that is far superior to stock.