In a previous post, I describe the design of a smooth LEGO clutch.

Here I introduce a version where I have added a differential to the top of the clutch. By rotating the main differential gear in one direction, the clutch will engage and rotate one axle. By rotating it the other direction, the clutch will engage and rotate the opposite axle.

It would be straightforward to attach a motor to this system.

Here are the building instructions.

Enjoy,
Kevin