Typical gear selector for an automatic transmission An automatic transmission (in some cases abbreviated AT) is a multi-velocity transmission Employed in motor motor vehicles that does not demand any enter from the driver to vary ahead gears underneath standard driving ailments. Lay Shaft: Lay shafts has fixed gears on it. https://gearboxauto96284.ampedpages.com/new-step-by-step-map-for-gearbox-auto-61094261