A powertrain for a Mild Hybrid vehicle, said powertrain comprising: - an engine; - a driveline including a gearbox having an input shaft connected to the engine, an output shaft to be connected to driving wheels of the vehicle and a countershaft couplable to the input shaft for transmitting a rotation of the input shaft to the output shaft; - an electric machine; - a coupling, in the form of a power take-off, which is connected to the countershaft, and configured to be coupled to a fitting of an auxiliary; - a gear reduction mechanism having a free wheel and at least three separate and rotatable junction elements, said junction elements including: - a first junction element that is connected to the electric machine; - a second junction element that is connectable to the free wheel; and - a third junction element; characterized in that the rotational speeds of the junction elements are interdependent but do not have a fixed ratio relative to one another, said third junction element being connected to the countershaft; wherein the torque ratio between the third junction element and the first junction element can be selected from at least two different ratios, namely a first ratio and a second ratio; said coupling being arranged at one end of a shaft which, in the mounted position, is an extension of the countershaft or is configured to have the same rotational speed as the countershaft, the powertrain further comprising an additional gearing mechanism as a connecting mechanism between the third junction element and the countershaft, the additional gearing mechanism being configured to create an offset along a direction orthogonal to the longitudinal direction, in the mounted position, between the countershaft and the first junction element. - an engine; - a driveline including a gearbox having an input shaft connected to the engine, an output shaft to be connected to driving wheels of the vehicle and a countershaft couplable to the input shaft for transmitting a rotation of the input shaft to the output shaft; - an electric machine; - a coupling, in the form of a power take-off, which is connected to the countershaft, and configured to be coupled to a fitting of an auxiliary; - a gear reduction mechanism having a free wheel and at least three separate and rotatable junction elements, said junction elements including: - a first junction element that is connected to the electric machine; - a second junction element that is connectable to the free wheel; and - a third junction element; - a first junction element that is connected to the electric machine; - a second junction element that is connectable to the free wheel; and - a third junction element; characterized in that the rotational speeds of the junction elements are interdependent but do not have a fixed ratio relative to one another, said third junction element being connected to the countershaft; wherein the torque ratio between the third junction element and the first junction element can be selected from at least two different ratios, namely a first ratio and a second ratio; said coupling being arranged at one end of a shaft which, in the mounted position, is an extension of the countershaft or is configured to have the same rotational speed as the countershaft, the powertrain further comprising an additional gearing mechanism as a connecting mechanism between the third junction element and the countershaft, the additional gearing mechanism being configured to create an offset along a direction orthogonal to the longitudinal direction, in the mounted position, between the countershaft and the first junction element.