Many modern and classic 4x4 SUVs and trucks feature part-time ... There's a lot of different types of 4WD, from your basic transfer case up to highly-advanced AWD (all-wheel drive) units on ...

While a 4x4 SUV runs in rear-wheel-drive or 2WD mode by default and comes equipped with a transfer case to divide power between the front and rear axles, an AWD system automatically distributes ...