This Is How An Automatic Transmission WorksDavid Tracy7/01/13 12:30pm866EditInvite manuallyPromoteDismissUndismissHideGo to permalinkEver wonder how your transmission knows to shift gears? Why is it that when you stop, the engine doesn't die? We're here to show you how cars work. We recently looked at manual transmissions. This week it's regular ol' slushbox time.