The friction bands will often be used for manually selected gears (including very low variety or reverse) and operate about the planetary drum's circumference. Bands will not be used if the generate/overdrive variety is chosen, the torque being transmitted because of the sprag clutches rather. The illustrations and standpoint in https://gearboxauto85307.shoutmyblog.com/32973911/the-basic-principles-of-gearbox-auto