Principally, the automatic gearbox employs a roller clutch for schedule upshifts/downshifts. It operates identical to a ratchet. It transmits the torque only in a single way by cost-free-wheeling or overrunning in the opposite. The benefit of such a clutch is that it eliminates the possibility of simultaneously applying the clutch https://eduardohhdax.blogsumer.com/33018020/an-unbiased-view-of-gearbox-auto