These made use of synchronizers to match gear speeds, allowing for smoother shifts and simpler driving. The mid-20th century saw the introduction of automated transmissions.  Computerized gearboxes get rid of the necessity for the clutch pedal, which disconnects the engine from your transmission in an effort to alter gear.   https://shanetwwur.ampedpages.com/examine-this-report-on-automobile-gearbox-61093662