The preselector gearbox is undoubtedly an older program, often located in vintage vehicles. It allows the motive force to "preselect" the following gear just before basically participating it. This system works by using a combination of gears and clutches to make the actual gear improve smoother and a lot quicker https://franciscodllli.blog-ezine.com/34282811/not-known-details-about-automobile-gearbox