The friction bands in many cases are useful for manually selected gears (such as lower range or reverse) and function around the planetary drum's circumference. Bands are usually not applied if the travel/overdrive assortment is chosen, the torque getting transmitted because of the sprag clutches instead. Twin-clutch automatic gearboxes started https://gearbox-auto87306.answerblogs.com/34005930/the-basic-principles-of-gearbox-auto