7. A system, comprising:an electric motor, the electric motor including:
a housing having a first end and a second end;
a hollow rotor shaft extending through the housing from the first end to the second end of the housing, the hollow rotor shaft having a first shaft end having an interior spline surface, and a second shaft end; and
a rear drive shaft received within the hollow rotor shaft, the rear drive shaft having a first splined end mating with the interior spline surface of the hollow rotor shaft and a second splined end opposite the first splined end; and
an axle coupled to the electric motor, the axle including an axle input shaft having an internal splined surface receiving the second splined end of the rear drive shaft.