Generally, the automatic gearbox employs a roller clutch for plan upshifts/downshifts. It operates just like a ratchet. It transmits the torque only in a single course by free-wheeling or overrunning in the other. The advantage of this sort of clutch is it removes the possibility of simultaneously implementing the clutch https://gearbox-auto31863.ampedpages.com/details-fiction-and-gearbox-auto-60775588