The terms 4x4 and 4x2 refer to the setup of the driveline in vehicles, generally specific to light trucks. Cars are usually considered 2WD (short for two-wheel drive) or AWD (all-wheel drive). Trucks or other rugged vehicles intended for off-road use often include a 4x4 driveline, also known as 4WD (four-wheel drive). The purpose is to allow vehicle operation in conditions or on roads that a typical car cannot manage.
The term 4x4 (or 4WD) is usually reserved for off-road ready vehicles, which have been designed to be driven far off paved roads (but at the expense of some on-road capability). In operation, the typical 4x4 drive-line connects the engine to the rear wheels through the transmission, and also connects the front wheels to the engine via the transmission and a transfer case. New trucks may be optioned with a "full-time 4WD" driveline.
Usually, vehicles equipped with a 4x4 driveline are built with higher ground clearances as well (lifted trucks), enhancing off-road capability. The advantage to powering all four wheels should be fairly obvious: in situations of poor traction, losing grip on one or two wheels does not stop the vehicle. Usually, the 4x4 feature is disabled for on-highway operation because the drivetrain is not designed for it due to the speed, although the full-time 4WD variety can be operated in 4x4 mode anywhere.
Trucks like the Ford F-150, Ford F-250, Ford F-350, Chevrolet 1500, Chevrolet 2500, Chevrolet 3500, Dodge 1500, Dodge 2500 and the Dodge 3500 can all be lifted and all have the option to be 4x4. The 250's, 350's, 2500's and 3500's can come with a gas engine or a diesel engine. Here at Millennium Motors we specialize in Lifted Trucks and sell to many people in Monroe WA, Snohomish WA, Woodinville WA, Everett WA, Bothell WA Kirkland WA, Bellevue WA, Seatlle WA and all the surrounding areas to as far down as Tacoma WA, Olympia WA and even in Oregon.