Type F or Dexron, why do some HP guys dislike type F

I run ATF+4 in everything now. As was said.. Type F had a friction modifier that the Dextron did not and that was why it shifter more harshly in Torquefiltes and FMC trannys. The B&M Trick Shift was basically a dyed Type F. Also initially Type F was green IIRC. The ATF+ fluids from Mopar are a Dextron type fluid, but they have additives that allow for less heat retention, which is why I run them. This was for the OD trannys and later FWD transaxles that were running hotter with more slippery convertors and 4cyls. It comes down to your tranny's assembly really. If you've upgraded the frictions, any fluid is fine. The seals don't know or care until it overheats. If the pressures and fluid control is right, the fluid won't hurt anything by changing. If they are on the tighter side and you are on the edge of too much overlap, changing fluids to something that allows for less slippage during engagement will cause problems.