The 2016 GMC Sierra HD lineup is equipped with the Eaton Locker automatic locking rear differential, and it comes in handy during times where getting traction can be difficult. It’s what GMC refers to ...

One of the things that Tesla is known for, apart from its loud-mouthed CEO, is its cars’ ability to get better over time thanks to over-the-air software updates. Anything from throttle response and ...

In garages, on trails, and around campfires, debate will always rage over what single modification is most effective in creating a capable 4x4. Is there one magic mod that can dramatically improve ...

Not all limited-slip differentials are made equal. There are an infinite different variations using different combinations of clutches, bite points, and fluid. But which one works best for your car?

We've seen some wrench benders in our travels, but Martin Barraza, the Drivetrain Direct technician in our photos, can disassemble an 8.8 axle about as fast as we can push the shutter on our Nikons.