Which part of the vehicle primarily transmits engine power to the wheels?

The drivetrain is indeed the part of the vehicle that primarily transmits engine power to the wheels. It comprises several components, including the transmission, driveshafts, differentials, and axles, working in unison to deliver power from the engine to the wheels, allowing the vehicle to move.

While the transmission plays a crucial role by adjusting the gear ratios to optimize engine output and provide different speeds, it's part of the broader drivetrain system. The clutch, on the other hand, is a mechanism that enables the driver to connect or disconnect the engine from the transmission, facilitating gear changes rather than transmitting power itself. Finally, the axles are the components that transfer power from the differential to the wheels but do not encompass the entire system that facilitates power transmission from the engine to the wheels. The term "drivetrain" effectively captures all these elements working together to achieve that power transfer.