These utilised synchronizers to match gear speeds, allowing for for smoother shifts and less complicated driving. The mid-20th century observed the introduction of automatic transmissions.  A handbook transmission needs the motive force to manually choose the gears[6] by working a equipment adhere and clutch (which is frequently a foot pedal https://charlieltttr.bloggip.com/34214679/the-smart-trick-of-automobile-gearbox-that-nobody-is-discussing