Only time I ever put type F in a 727 was years ago. I had a push button 727 in my 64 300. Decided to do a band adjustment and fluid and filter change. Reading the DC books lead me to think putting in type F might be an improvement. Drained out the whatever was in it, did my band adjustments put in a new filter, filled it up with type F. Two days later it's slipping and all the friction material came off the clutches.

Coincidence?

I don't think so and the cost of even a DIY rebuild is more than I care to spend to retest the type F experiment.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.