The main difference between AWD vs. 4WD is that all-wheel drive powers all four wheels at all times and 4WD powers all four wheels only when put into 4WD mode.

The transfer case is a critical part of four-wheel-drive and all-wheel-drive vehicles. How often does its fluid need to be replaced? And what does that cost?

In 4WD cars, the drop in fuel economy can be as much as three mpg compared with 2WD models. Of course, these negatives can be offset by the positives of an AWD vehicle.

Another major mechanical difference between 4WD and AWD is the lack of a transfer case on the latter type of system. While the division of power is handled through differentials, a t-case isn’t ...

If you're looking to take your car off the beaten path now that the weather is warming up, you'll want to make sure you have the right car for job.