To obtain the transmission into overdrive, numerous factors need to be linked and disconnected by clutches and bands. The World provider will get linked to the torque converter housing by a clutch. The small sun will get disconnected from the turbine by a clutch making sure that it can freewheel. https://gearboxauto86418.mybuzzblog.com/13499353/5-simple-statements-about-gearbox-auto-explained