A torque converter-mounted generator is provided that, along with power electronics, offers at least two types of electrical power output and may be attached to a transmission without impacting the axial length of a powertrain in comparison to a powertrain with an identical transmission and a torque converter not having a generator mounted thereto. Different torque-converter mounted generators and power electronics configurations providing different combinations of electrical power voltages may be offered for use with a given transmission type, thus allowing flexibility in meeting customer needs without unduly impacting assembly of the powertrains. A method of assembling transmissions is also provided.