The friction bands in many cases are used for manually selected gears (for instance very low range or reverse) and work within the planetary drum's circumference. Bands are not utilized when the drive/overdrive selection is chosen, the torque being transmitted because of the sprag clutches rather. Twin-clutch automatic gearboxes began https://gearbox-auto42974.webbuzzfeed.com/34295090/5-easy-facts-about-gearbox-auto-described