Abstract: A self-locking or limited slip differential gear for motor vehicles comprises a housing from opposite sides of which project two coaxial output shafts for connection to respective half shafts of the vehicle; linking the housing and the output shafts is a mechanism comprising a central body rotatable with respect to the housing and engaged on either side with a respective connection body which is not rotatable with respect to the housing but is slidable with respect thereto along a line perpendicular to the axis of rotation of the central body; engaged in these connection bodies are blocks carried on eccentric pins fixed to the output shafts and the axes of which are parallel to the common axis of the output shafts.