Re: open or closed drive line
The "78" case three speed center shift transmission can be found in the 39 passenger cars but they were used in pick ups from 1939 to 1950 so are still common. The work it takes to convert to open drive would be excessive in my book. The open drive transmission can be easily converted to the passenger car configuration by changing the rear mount to whatever one will work for you. The guts from any side load remote control car transmission from 1940 to 1948 can be used to fill the case.
Mac VanPelt has an excellent book on identification of gears and overhaul of these venerable old cog boxes. Check his web site for info.
Kerby
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