What I'm gathering from this article about the history of Ford-O-Matics, is that they were built at a new plant to manufacture their new automatic transmission. It was the Fairfax Transmission Plant, in Fairfax, Ohio, outside Cincinnati. I've found no info about them being built in Canada.
https://www.thetruthaboutcars.com/20...ssions-part-i/
https://en.wikipedia.org/wiki/Cruise-O-Matic