This is the ORIGINAL 6-speed design that revolutionized the American V-Twin industry. Yet, its still the best overdrive 6-speed built to this day hands down. Our OD6 is built to comfortably handle the power from todays big-inch motors. This transmission is rated for motors putting out up to 165ft/lbs of continuous use. It is available as a complete transmission with a wide variety of case options and configurations, or as a builders kit for your stock case application, which requires little to no modification. The BAKER OD6 is available with many optional gear ratios to match your engine torque and riding style. overdrive 6-speed builders kit