What is a Differential?
The differential in your rear-wheel-drive (RWD) vehicle houses the gears between the rear wheels. These gears provide the wheels the ability to maneuver independently from one another when you go around a corner.
The wheels closest to the turn are called the inside wheels, and those on the opposite side of the vehicle are referred to as the outside. When you turn a corner, the inside wheels only need to travel a short distance to get around the turn, so their speed is slower. The outside wheels, though, make a wide arc. To accommodate the wheels’ distances...