Most at the moment-manufactured passenger autos with gasoline or diesel engines use transmissions with four–10 ahead gear ratios (also known as speeds) and one reverse equipment ratio. Electric powered autos typically use a fixed-equipment or two-speed transmission without having reverse gear ratio. Overdrive is especially useful for extended-distance freeway driving, https://emilianohifbw.sharebyblog.com/33564636/automobile-gearbox-for-dummies