Brinn Racing Transmissions with the low rotating weight, internal clutch and smooth shifting, they are hard to beat. The original two-speed transmissions offer two power paths of success for your circle track racer. Direct drive and low gear move you forward unlike that of the competition and reverse is not meshed with any other gears while in either forward path--no robbed horsepower or reduced acceleration. Brinn's dog clutch and detent design of these original transmissions offer durability and the smoothest shifting without the need of special shifters. Available in aluminum or magnesium, there are no welded parts; all parts are billet or cast and precision CNC-machined. Bolts in place of stock GM transmissions. Crank drive flange not included.