Trans Fluid....+4?

Tony,
My recommendation to use type F was based on what I read in an old Direct Connection Performance manual. The book said it has a higher level of friction for firmer shifting.
Someone that I trust on a different forum had this to say:

Type F has a more aggresssive coefficient of friction, this makes for firmer shifting but at the expense of some lubricating properties; the idea of mixing in Dexron is to increase the lubricating properties. Some guys even throw in a quart or two of synthetic 10-30 engine oil to a load of type F for the same reason.

In reality, no harm will come from mixing types, Mopar even states that the newer ATF+4 is backwards compatible with all previously recommended fluids. (Dexron, 7176, +2, +3)

It kinda sounds like Dexron will be good enough to get all that slant 6 power to the ground.