Type F fluid in 727

My pals in the awl bidness say no to Type F unless it is specified for the application. It's not as slick as Dexron/Mercon and will accelerate wear on transmissions not designed to use Type F.

Collectively we put together a history that explains where it came from. 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. Somewhere in the 66-68 timeframe, Ford took a clutch disk out of each of the two clutch pack assemblies in the C-6 in search of a little more efficiency. (They also developed the C-4 for use on the small blocks.)

When they took the clutch disks out, they found they had lost some clamping effect. They figured a higher viscosity fluid with a different additive package would help recover most of the loss in clamping without loss of efficiency. The result was Type F. It was in corporate-wide use until 1977 and on some specific units until 1980. It's mostly a Ford affliction, although a few Volvos, Mazdas, and Toyotas used it, too.