Power shift transmission is a term used to describe a type of automotive transmission that uses hydraulics and gears to transfer power between the engine and the wheels. Alternate terms for power shift transmission include hydraulic transmission, hydromechanical transmission, and power shift gearbox. Other synonyms for this term include automated manual transmission, clutchless manual transmission, and sequential manual transmission. These terms are often used interchangeably in the automotive industry and while they may vary slightly in design and function, they all share the same basic principle of transferring power from the engine to the wheels in a smooth, efficient manner.