Transmission mechanism for a motor vehicle, the transmission mechanism comprising: a differential which has a differential housing, on which a main reduction gearwheel is provided, two output shafts which extend starting from two sides of the differential, the two output shafts each transmitting power to a wheel of a vehicle, a first gearwheel set which is formed from a first gearwheel and a second gearwheel which are in engagement with one another, the first gearwheel being arranged coaxially with respect to the two output shafts, and power which drives the vehicle for travelling being input into the first gearwheel, a second gearwheel set which is formed from a third gearwheel and the main reduction gearwheel, arranged on the differential housing, which are in engagement with one another, the third gearwheel being arranged coaxially with respect to the second gearwheel, a third gearwheel set which is formed from a fourth gearwheel and a fifth gearwheel which are in engagement with one another, the fourth gearwheel being arranged coaxially with respect to the second gearwheel, characterized in that the fifth gearwheel is arranged coaxially with respect to the two output shafts, and in that, furthermore, the transmission mechanism comprises a fourth gearwheel set which comprises a sixth gearwheel and a seventh gearwheel which are fastened to one and the same shaft, the sixth gearwheel being in engagement with the fifth gearwheel, and the seventh gearwheel being in engagement with the main reduction gearwheel which is arranged on the differential housing, and a switchover device which is arranged coaxially with respect to the second gearwheel and is driven by the second gearwheel, it being possible for the switchover device to be coupled selectively to the third gearwheel or the fourth gearwheel. a differential which has a differential housing, on which a main reduction gearwheel is provided, two output shafts which extend starting from two sides of the differential, the two output shafts each transmitting power to a wheel of a vehicle, a first gearwheel set which is formed from a first gearwheel and a second gearwheel which are in engagement with one another, the first gearwheel being arranged coaxially with respect to the two output shafts, and power which drives the vehicle for travelling being input into the first gearwheel, a second gearwheel set which is formed from a third gearwheel and the main reduction gearwheel, arranged on the differential housing, which are in engagement with one another, the third gearwheel being arranged coaxially with respect to the second gearwheel, a third gearwheel set which is formed from a fourth gearwheel and a fifth gearwheel which are in engagement with one another, the fourth gearwheel being arranged coaxially with respect to the second gearwheel, characterized in that the fifth gearwheel is arranged coaxially with respect to the two output shafts, and in that, furthermore, the transmission mechanism comprises a fourth gearwheel set which comprises a sixth gearwheel and a seventh gearwheel which are fastened to one and the same shaft, the sixth gearwheel being in engagement with the fifth gearwheel, and the seventh gearwheel being in engagement with the main reduction gearwheel which is arranged on the differential housing, and a switchover device which is arranged coaxially with respect to the second gearwheel and is driven by the second gearwheel, it being possible for the switchover device to be coupled selectively to the third gearwheel or the fourth gearwheel.