A modular clutch assembly with two independent power sources and a connection with an output device. The two independent power sources and the output device can take many different forms. The modular clutch assembly has a housing that connects the two power sources with the output device and controls power transfer using an inner clutch and an upper clutch. There is further provided an output hub connected to the output device, where the output hub extends into the modular clutch assembly for selective rotation. The output device in one exemplary embodiment of the invention is a transmission of a vehicle.