[David_Hayward (RIP)]

I know that McKinnon Industries of St Catherines, Ontario produced cases from 1940, for GM and Ford. I have in recent times established that Ford had an axle plant in Windsor, and therefore they could have produced a version of the GM casing some time after McKinnons...McKinnons themselves almost certainly licensed their designs from Timken Axle Corp, Detroit. Ford could also by the same token have built the F15A/C15A cases to their own design avoiding licence payments etc.