Here's some tech info on all of the various types of ATF:

http://www.pzlqs.com/Tech/Bulletin//DomesticMarketing/ProductApplications/pdf/p44a.pdf

It says, as I'd thought, that Type F isn't friction modified, hence isn't as slippery as a more friction-modified fluid.

Which brings up the question of why friction modifier which makes the fluid more slippery would allow the synchros to work better, anyone know?

Brian