Re: 1935 Columbia firewall picture
In 1946 they did change to a vacuum operated speedometer changer. I have run that setup in my 1941 ford. When I put the Columbia in my 36 Roadster I did not like that when the speedometer would shift it was not always in sink with the rear end, so that's when I swapped mechanical arm for the vacuum changer.
Not sure about your other question though. John at Columbia Two Speed Parts was very helpful sharing information with in my installation.
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