FWIW I was told the same thing concerning the Trick shift but instead of type F it was the type FA. The difference is the "A" is an antifoaming agent. I was also told the F or FA builds a slightly higher line pressure from being a different vescosity.
I've been leery to run the FA since I was told about it, WHY because the tranny that I lost 2nd gear in was built by the guy who recommended it. I'm still considering the change to the F or FA on the current transmission. JD
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Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! 
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