A vehicle powertrain system comprising an electric motor, a planetary gear set, a coupling unit, and a differential unit, wherein the electric motor is drivingly connected to the planetary gear set via a motor shaft extending in an axial direction, and wherein the planetary gear set is operably connectable to the differential unit via the coupling unit, wherein the powertrain system further comprises an idle gear wheel and a differential drive gear wheel arranged on the differential unit, wherein the coupling unit is arranged for selectively transferring torque to the idle gear wheel, and wherein the idle gear wheel and the differential drive gear wheel are arranged to drivingly interact with each other for transferring torque from the electric motor to the differential unit, via the planetary gear set and the coupling unit, wherein the differential unit comprises a first differential output shaft and a second differential output shaft, wherein the first differential output shaft and the second differential output shaft are extending in the axial direction laterally on each side from the differential housing, characterized in that the differential unit is configured for being positioned in a lateral centre section of a vehicle in which the vehicle powertrain system is arranged, wherein the powertrain system further comprises a first drive shaft connected to and extending from the first differential output shaft and a second drive shaft connected to and extending from the second differential output shaft, wherein the first drive shaft is having an axial length (L DS1) greater than an axial length (L OS1) of the first differential output shaft and wherein the second drive shaft is having an axial length (L DS2) greater than an axial length (L DS2) of the second differential output shaft, wherein the first drive shaft is connected to the first differential output shaft via a first joint and the second drive shaft is connected to the second differential output shaft via a second joint, wherein the joints (18a,18b) are allowing angular displacement of the drive shafts (17a,17b) in relation to the differential output shafts (15a,15b). wherein the electric motor is drivingly connected to the planetary gear set via a motor shaft extending in an axial direction, and wherein the planetary gear set is operably connectable to the differential unit via the coupling unit, wherein the powertrain system further comprises an idle gear wheel and a differential drive gear wheel arranged on the differential unit, wherein the coupling unit is arranged for selectively transferring torque to the idle gear wheel, and wherein the idle gear wheel and the differential drive gear wheel are arranged to drivingly interact with each other for transferring torque from the electric motor to the differential unit, via the planetary gear set and the coupling unit, wherein the differential unit comprises a first differential output shaft and a second differential output shaft, wherein the first differential output shaft and the second differential output shaft are extending in the axial direction laterally on each side from the differential housing, characterized in that the differential unit is configured for being positioned in a lateral centre section of a vehicle in which the vehicle powertrain system is arranged, wherein the powertrain system further comprises a first drive shaft connected to and extending from the first differential output shaft and a second drive shaft connected to and extending from the second differential output shaft, wherein the first drive shaft is having an axial length (L DS1) greater than an axial length (L OS1) of the first differential output shaft and wherein the second drive shaft is having an axial length (L DS2) greater than an axial length (L DS2) of the second differential output shaft, wherein the first drive shaft is connected to the first differential output shaft via a first joint and the second drive shaft is connected to the second differential output shaft via a second joint, wherein the joints (18a,18b) are allowing angular displacement of the drive shafts (17a,17b) in relation to the differential output shafts (15a,15b).