A modular gearbox unit and drive system are provided. The modular gearbox unit and drive system may be part of a vehicle platform having multiple drivetrain mount areas including identical mount features disposed at each mount area. Each drivetrain mount area can receive a modular single-motor drive unit or a modular multiple-motor drive unit using the same mount or bolt pattern and features. These modular single-motor and multiple-motor drive units have a common bolt pattern and mating features that correspond to the mount features of the vehicle platform and/or vehicle frame. The modular gearbox unit and drive system allows a vehicle powertrain to be reconfigured, during or after assembly, quickly and easily using the same mount points.