The friction bands are frequently useful for manually chosen gears (like small selection or reverse) and run about the planetary drum's circumference. Bands are certainly not used if the generate/overdrive range is chosen, the torque remaining transmitted with the sprag clutches as an alternative. Instead, they utilize a torque converter https://gearbox-auto29741.nizarblog.com/33952220/a-simple-key-for-gearbox-auto-unveiled