26 and 28 also includes three points of meshing engagement i e points of contact for example the combination gears 26 and 28 have respective first points of meshing engagement 74 and 76 with the side gears 22 and 24 and have respective second and third points of meshing engagement 78 and 80 with each other the first points of meshing engagement 74 and 76 are located midway of the side gear face widths the second and third points of meshing engagement 78 and 80 are located midway of the second gear section face widths transverse planes 82 84 86 and 88 appear on edge in fig3 intersecting the respective points of meshing engagement 78 74 76 and 80 the second and third points of meshing engagement 78 and 80 are located at respective distances 34 a 1 34 and 34 b 1 34 along the common axis 18 from the first point of meshing engagement 74 and at respective distances 34 b 2 34 and 34 a 2 34 along the common axis 18 from the other first point of meshing engagement 76 for sake of simplicity the distances 34 a 1 34 and 34 a 2 34 or an average of these distances can be considered equal.