In a motor vehicle, the term powertrain refers to the group of components that generate power and deliver it to the road. This includes the engine, transmission, drive shafts, differentials, and the final drive (drive wheels, continuous track as in tanks or Caterpillar tractors, propeller, etc.). Sometimes "powertrain" is used to refer to simply the engine and transmission, including the other components only if they are integral to the transmission.
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