A key part of getting a car's power to the ground effectively is the differential, which uses gearing to regulate the split of power between wheels on an axle. This video shows exactly how it works.

As far as car fluids go, differential oil is one of the most neglected pieces of maintenance. It could be because the effects of not changing differential fluid on time aren't as immediately obvious ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through the links below." Changing the car differential oil—it's one of the most-overlooked maintenance tasks on non-FWD light ...