What is the purpose of the differential in a truck's drivetrain?

The purpose of the differential in a truck's drivetrain is to allow for the unequal rotation of wheels during turns. When a vehicle makes a turn, the wheels on the outside of the turn travel a longer distance than the wheels on the inside. A differential accommodates this difference in distance rotated by each wheel by enabling them to spin at different speeds. This function helps the vehicle maintain stability and control while cornering, reducing tire wear and improving overall handling.

While the other options might seem relevant to the overall function of a vehicle's drivetrain, they do not accurately describe the specific role of the differential. The differential is not primarily designed to equalize torque between wheels, increase power available, or enhance fuel efficiency; its main function revolves around adapting to varying wheel speeds to prevent skidding and provide better traction during maneuvers.