Most currently-made passenger autos with gasoline or diesel engines use transmissions with 4–ten ahead equipment ratios (also called speeds) and one reverse equipment ratio. Electrical motor vehicles usually use a hard and fast-equipment or two-pace transmission without any reverse equipment ratio. Automatic gearboxes appeared commercially from the forties, according to https://automobilegearbox63074.csublogs.com/40681888/considerations-to-know-about-automobile-gearbox