From https://en.wikipedia.org/wiki/DrivetrainThe drivetrain of a motor vehicle is the group of components that deliver power to the driving wheels. This excludes the engine or motor that generates the power. In contrast, the powertrain is considered to include both the engine or motor and the drivetrain.
The precise components of the drivetrain vary, according to the type of vehicle.
Some typical examples:
Manual transmission car
Rear axle with hypoid bevel gear final drive
Overdrive Only rarely fitted
Automatic transmission car