Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A preselector gearbox is a type of manual gearbox (US: transmission) used on a variety of vehicles, most commonly in the 1930s. The defining characteristic of a preselector gearbox is that the manual shift lever is used to "pre-select" the next gear to be used, then a separate control (a foot pedal) is used to engage this in one single operation, without needing to work a manual clutch. Most pre-selector transmissions avoid a manual clutch entirely, some use one solely for starting off. Pre-selector gearboxes are not automatic gearboxes, although they both share some aspects and past influences of epicyclic gearboxes. A fully-automatic gearbox selects the ratio used, with a pre-selector gearbox this remains a manual choice. There are several radically different mechanical designs of pre-selector gearbox.

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