The friction bands are often used for manually picked gears (which include low assortment or reverse) and function about the planetary drum's circumference. Bands are not applied if the drive/overdrive selection is selected, the torque currently being transmitted because of the sprag clutches as an alternative. Sensors in automatic transmissions https://gearbox-auto17259.ampedpages.com/little-known-facts-about-gearbox-auto-60775456