Transmissions in automobiles are either automatic or manual. Automobiles with manual gearboxes are also known as clutches or stick-shift vehicles. Automatic transmissions are the most widespread and are most likely what you drive. A transmission’s primary function is to translate speeds and torques along a vehicle’s drive system. This means that it changes a vehicle’s gear ratios automatically, allowing it to drive within its limited speed range while yet producing a wide variety of torque and output speeds.