Sorry to disappoint red-five but epicyclic geartrains are much more efficient at transferring torque than the pre 19th century layshaft geartrain concept. They can also be much lighter because they have balanced burst loads.
Torque converters are inefficient until they are locked and have a weight penalty but then so are manual clutches that convert torque into high temperatures. Hydraulic operation also drains torque in automatics. It is even worse when using traction fluid in CVT,s or TVT's. These flatter to deceive using far to much power to operate.
Layshaft gearboxes are controlled using what amounts to a banana in a bowl of custard, the modern electronic control over gear selection is simply allowing a computer waggle the banana.
I suggested this automatic control over layshaft selection to Ferrari in 1988 based on my work during the 1970,s and 80,s, for the systems still to be in use makes me despair.
They are still using torque robbing layshaft geartrains either dog engagement or even worse twin shaft/clutch systems that drain even more torque in road cars.
The answer is no clutch or torque converter or hydraulics in a stepped ratio epicyclic. I have such a system.
