Agreed, Mark. The once substantial efficiency differential between manual automotive transmissions and automatic transmissions of similar era are now vanishingly small.
Eventually, I expect automobiles, heavy trucks, farm tractors, etc., will have electronic transmissions.
GM developed a motor scraper (pan) with an electrical (not electronic) transmission in the 1960s but it was not marketed. Rather than front and rear engines as other self loading motor scrapers used at the time, The prototype had a single Detroit diesel 6V (8V?) 71 in the front driving a generator or alternator (can't remember) and electric motors were used on each wheel. The electrical transmission was similar to that used in railroad locomotives at the time. The electrical system was developed by Delco Products in Dayton, OH. The Euclid division developed the rest of the scraper.
The design was successful but it was not marketed due to changing economic conditions.
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