Illinois CDL Practice Exam

The drive shaft is not considered a key steering system part on a vehicle. The primary function of the drive shaft is to transmit power from the engine to the wheels, specifically in vehicles with a rear or all-wheel drive system. It plays a crucial role in vehicle propulsion but does not contribute to the steering mechanism. In contrast, steering arms, the pitman arm, and tie rods are all integral components of the steering system, working together to allow the driver to control the direction of the vehicle. Steering arms connect the steering mechanism to the wheels, the pitman arm transfers motion from the steering gear to the steering linkages, and tie rods connect the steering gear to the steering knuckles, enabling the wheels to turn in response to steering inputs.