Automatic vehicle transmissions convert the engine's torque and speed into traction and vehicle speed. They consist of torque converters, planetary gears, power-operated servo brakes and clutches, oil pumps, as well as hydraulic and electronic control units. Their interaction regulates starting, gear shifting, and traction control based on the engine's operating data, the vehicle's requirements, and the driver's preferences. This book provides essential knowledge necessary for the design of automatic transmissions for passenger and commercial vehicles. All components, their functions, and the control mechanisms are described in a practical manner, with diagrams and illustrations prioritized over text wherever possible. Numerous examples of automatic transmissions from around the world are presented.