Differential gear assembly and method of assembling the same

A differential gear assembly comprising:

• a housing comprising a first housing plate and a second housing plate;
• a first pair of gears of which each gear is mounted rotatably around a first axis of rotation (A1) and within the housing;
• a second pair of gears of which each gear is mounted rotatably around a second axis (A2) of rotation and within the housing while engaging the gears of the first pair of gears, wherein the second axis of rotation is normal to the first axis of rotation;
• wherein that the first and second housing plate have a substantially identical shape and size, said housing plates each comprising an outer flange having substantially a same outer diameter;
• wherein the differential gear assembly further comprises an outer helical ring gear that is fixed to the housing, wherein the outer helical ring gear comprises an inner flange for mounting to the outer flange of the first or second housing plate, wherein an inner diameter of the inner flange is smaller than the outer diameter of the housing plates.