A permanent four wheel drive motor vehicle

The motor vehicle comprises a first driven axle (2) coupled by means of a transmission shaft (20) to a second axle (3) which includes two half-shafts (5,7) between which is interposed a differential (13), and a controlled coupling device (15) interposed between this differential (13) and one half-shaft (7) of the second axle (3), and an electronic control unit ECU arranged to control the said coupling device (15) in such a way as to control the transfer of torque from the transmission shaft (20) to this half-shaft (7) in a predetermined manner.