The preselector gearbox is undoubtedly an more mature method, normally located in vintage automobiles. It lets the driving force to "preselect" another gear prior to actually partaking it. This technique makes use of a combination of gears and clutches for making the actual gear transform smoother and a lot quicker https://lorenzojpomj.ampedpages.com/the-fact-about-automobile-gearbox-that-no-one-is-suggesting-61094717