What is the primary function of the driveshaft in a vehicle?

The primary function of the driveshaft in a vehicle is to connect the transmission to the rear differential. This is crucial in the drivetrain system, particularly in rear-wheel drive vehicles, where the power generated by the engine and transmitted through the transmission needs to be conveyed to the rear wheels.

When the engine operates, it generates power that is sent through the transmission. The driveshaft then takes this rotational motion and transfers it to the differential, which further distributes the power to the wheels, allowing them to turn and propel the vehicle. The driveshaft is designed to handle high torque and is typically made of strong materials to withstand the stresses it faces during operation.

In contrast, the other options do not accurately describe the driveshaft's role. The fuel system connection to the engine relates to the supply of fuel for combustion, the battery to electrical system connection addresses power supply to electrical components, and the front axle to rear axle connection pertains more to the vehicle’s overall suspension and drive mechanism but does not define the function of the driveshaft specifically.