The Jeep Grand Cherokee offers both all-wheel drive (AWD) and what Jeep calls "Quadra-Trac" systems, which are their versions of 4x4 (four-wheel drive) with varying levels of driver control. It does *not* have a system simply called "4 on command." "4 on command" is a system used by other manufacturers.
The specific system available depends on the trim level and year of the Grand Cherokee. Some models offer full-time AWD, while others offer selectable 4x4 systems with different capabilities (like low range gearing).
