best auto trans fluid

The 303 is available everywhere....it's just been reformulated. I'm not sure I'd run it in your situation, Robert. I think a good synthetic would probably serve you well. It's not necessarily what type fluid, but that you keep it cool in your situation, so a good, BIG cooler will be most important. Of course a good synthetic will run cooler too, so it's a win/win if you run synthetic and a good cooler.