How Audi Quattro AWD Works - Find the best Audi deals! A differential is a set of gears that powers wheels at the axle. The original Quattro system featured three differentials (front, rear, and ...

What you need to know to go in the snow in the big storm. The difference between AWD and 4WD. Why tech keeps your car going straight when you do dumb things.

Here's how all-wheel drive (AWD) or four-wheel drive (4WD) work, their pros and cons and when they're most useful. Many, or all, of the products featured on this page are from our advertising ...