A transmission transmits power from the engine to the wheels, enabling the car to move at different speeds and handle varying driving conditions. The transmission ensures that the engine operates within its optimal range of speed and power, transferring the energy generated by the engine into the necessary force to propel the vehicle.

The axle is a central component of a vehicle's drivetrain responsible for transmitting power from the engine to the wheels. It plays a crucial role in supporting the weight of the vehicle and maintaining wheel alignment. There are two main types of axles in most cars: the front axles and the rear axles.

A differential’s primary function is to allow the wheels to rotate at different speeds while receiving power from the engine. This is particularly important during turns, where the wheels on the inside and outside of the curve need to travel different distances.

A transfer case is a component found in four-wheel drive vehicles. It distributes power from the engine to both the front and rear axles, allowing for variable torque between the front and rear wheels. This is essential for improved traction and stability, especially in off-road conditions or situations where wheel slippage may occur.

A clutch is a mechanical device in a car that engages and disengages the transmission and the engine. Its primary purpose is to allow the driver to control the power and torque transfer between the engine and the transmission, enabling the changing of gears and the modulation of power to the wheels. Clutches are commonly found in manual transmission vehicles, where the driver is responsible for selecting and engaging the gears.