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A2 trucks have a heat exchanger and an air/air cooler. A1 trucks only have the exchanger. All that crap that builds up in the radiator you see from the coolant sitting for so long can actually build up across all the little holes in the heat exchanger and block half of it. The engine cool...

I did when I had the Allison in my truck. I also ran an extremely large cooler that my temps never got above 160 degrees. It takes alot to get all the fluid out. A simple flush will not get it all on the first try. Regular 10w or 15-40 is just as good as Dextron III just some folks live by...

Did you verify the actual temp with an infared gun? Never trust the dash gauge. If it is hot off an IR gun then heat exchanger is probably clogged up full of crap and not allowing proper circulation no matter how many coolers you add. Check the flow rate and report back. Or you may have a...