Every diesel truck on the road today has a differential and ring and pinion gear set in the rear axle. Four-wheel-drive trucks add a second set of gears and another differential to the front axle to ...

A differential plays an essential role in pushing or pulling a car in a straight line and efficiently and comfortably moving it through a corner. Basically, it’s a device that allows two sides of an ...

4x4 axles come in all shapes and sizes for recreational and competition wheelers. From the heavy-duty 21⁄2-ton Rockwell to the classic lightweight Dana 30, each axle has its own definitive qualities.

With 350 hp underhood and an all-wheel-drive system to keep all those horses out of the ditch, the Ford Focus RS already offers a commute-friendly version of a Group B hatch, minus the wild body kit.

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Changing the car differential oil—it's one of the most-overlooked maintenance tasks ...

All-wheel-drive systems are proliferating through the car market like so many tribbles on Kirk’s Starship Enterprise. These systems promise all-weather assurance as well as dry-road dynamic benefits, ...