As the fluid continually circulates it re-heats & re-cools redundantly.Regular ATF fluid becomes Brittle, losses its molecular coheasion and fragment off free radicals. At this time, its lubricive abilities begin to be compromised as is it's capability to hold contaminants & solid particals in suspension especially when cooled down as it passes through the trans cooling coil. Also it continues to loose its ability to absorb & carry away heat generated by the functions of tranny, it builds a thermally insulative barrier on the inner surfaces of the trans. cooling coils, limiting the fluids ability to cast off much of the heat it did manage to arrive with. Now the fluid components become not only chemicaly unstable they start to recombine altering its PH to a state the is now chemically corrosive to metal. As you know, chemical activity increases exponentially as its temperature increases. If I was someone who was reading this post, this is where I'de think, "Ya, so what? If this guy has any point to make, better be now. So,The moral to my story is , "There's a product called TransTune
the you add to transmission & then drive your truck while circulating through out your Tranny Sys. that neutralizes any corrosive PH conditions,breaks down internal varnish ,sludge deposits, metalic and other hard particals and holds cotangent in suspension for removal when drained prior to fluid flush &/or change. The amount of crap that drains out w/the fluid a lot more than you expect and its particle breakdown & suspension properties will make the flush procedure much more likely to eliminate contaminant deposit rather than just it's redeposition and flushing only has minimal effect in restoring the thermal transfer & dissipation abilities of the cooling coil tubes. Now that it is it in the cleanest operational state since new, DON'T just PUT THE SAME CRAP BACK IN IT!!!! Ford even says its ok change over gradually over multiple fluid changes as they're completely compatible but the benefits will only be proportional to the percentage it makes up of the total volume of fluid. One part Jack Danial's & One part Chivas Regal? I guess is better than leaving the Chivas bottle up on the shelf to stare at. But at 100% Syth. make up, the Op.Temp. of your Tranny is reduced 20 degree's F.