The friction bands in many cases are used for manually selected gears (for instance minimal array or reverse) and run around the planetary drum's circumference. Bands are usually not applied in the event the push/overdrive vary is chosen, the torque currently being transmitted via the sprag clutches in its place. https://cruzriten.dailyblogzz.com/34350238/a-simple-key-for-gearbox-auto-unveiled