A vehicle driveline system for a vehicle is provided. The system comprises a differential (110) having two output shafts (111,112) being connectable with respective wheel shafts, a primary electrical motor (121) being connected with a driving input (117) of the differential (110) via a first reduction gearing (130), said first reduction gearing (130) being connected to a secondary electrical motor (122) for adjusting the gear ratio of the first reduction gearing (130); whereby the secondary electrical motor (122) is connected to a clutch arrangement (150) configured to selectively lock the gear ratio of the first reduction gearing (130).