Diagram of a drivetrain
A drivetrain on any powered vehicle is the complete system that makes the vehicle run under its own power. It includes the engine, clutch/torque converter, gearbox, transfer case (for 4wd or awd vehicles) drive shafts, differentials, and axles. You will note that the engine (diesel, gasoline, steam, electric) is only one part of the drivetrain.
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