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There are already several automated manual transmissions on the market available in several configurations. Eaton has the ultra shift and volvo has the ishift. In both cases there are no torque convertors and the automatic gear seems to add about 1000 pounds in weight vs the stick shift. My opinion is the volvo system works better.
There is no way an over the road truck is going to use hydraulic drive. The weight of that system would quickly suck up any fuel savings.
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