If you want to try the F fluid, try it......if you kill something than it is your rebuild not mine. The B&M fluid is formulated to work with dextron/mercon fluid and won't damage the fiber of the plates, unless you apply those clutches super fast which is hard on anything! GM manufacturers the clutch fiber plates to be used with dextron fluid just as Chrysler manufactured my 47RE to be used with atf +4. If you substitute dextron in my 47re then shift characteristics change and can damage the transmission, unless you like shuddering etc. My point is this, if you want a firmer shifting transmission, install a shift kit in the valve body. If you deside to sell it you can always change the springs to the tow/rv stuff and you would have been happy along with the person that is buying the car. It doesn't matter to me one way or the other, but changing to a type f fluid is just the wrong way about gettting to a firmer shift and could be more costly as a result.
