Rear wheel drive car 4x4 and 4x2 equal. Chassis 4x4 vehicles differs only front wheel drive (photo). The transfer case is strengthened in the back of the transmission housing and transmits torque to the front and rear wheels via drive shafts. The rotation is transmitted to the front wheels through a gearbox containing the main transmission and differential, and axle shaft. The front wheels are installed self-locking of the hub by which the rotation is transmitted by the semi-axes of the wheels or wheel rotates in a free mode.