Which component of an automatic transmission is responsible for transferring the engine's power to the transmission?

The torque converter is the key component responsible for transferring the engine's power to the transmission in an automatic vehicle. Its primary function is to couple the engine's output to the transmission while allowing for some flexibility. The torque converter contains a fluid coupling mechanism that enables it to transmit power seamlessly, along with a mechanism to increase torque when needed.

When the engine runs, it spins the torque converter, which uses transmission fluid to send power to the transmission's input shaft. This facilitates smooth gear changes and allows the vehicle to accelerate without the need for a manual clutch operation. The design of the torque converter helps absorb engine speed variations, thereby enabling the vehicle to manage power effectively.

In comparison, the clutch is primarily associated with manual transmissions, the flywheel is part of the engine assembly and helps to smooth out power delivery from the engine, and the differential is crucial for distributing power to the wheels rather than for transferring it from the engine to the transmission.