Power steering fluid in the transmission

Well my owners manual states that all transmissions auto and manual where filled with dexron 3 from factory. And given what oils were around back then I'd imagine as it was back home in New Zealand older car all got dexron 3 both in the Trans as well as the steering.
For that matterror I've run all my 2 stroke motocross bikes with it in the Trans as well as all late model Hondas.
I'd imagine there is very little difference in the oil compared to what was in your box. April from being maybe a little over full if it was added when not needed