Type F fluid in 727

The first Ford corporate-wide automatic was the Cruise-O-Matic. It was big, heavy, and durable. It was a bit of a power hog and caused quite a hit in fuel mileage. It was known in other circles as the C-6.

I don't know about this. Daddy had a 65 Falcon with a 170 and it had a C4 that clearly said "Cruise O Matic" on the gear selector tab on the steering column. Read this. It talks about the "C4 Cruise O Matic" too.

http://auto.howstuffworks.com/1960-1965-ford-falcon12.htm

There was the C3, C4 amd C5, all of which were versions of the C4. The C6 was different transmission altogether. Much in the same way there are differences in the 904 and 727.