I agree with Bill, why do you think you need a trans cooler at all ?
I see very few FED dragsters with coolers, SuperComp with over 50 cars when they run round robin, yes, but nostaliga dragsters don't run round robin.
No JrFuel teams run coolers, or NE-1-2-3, OR 7.0 Pro.
It's just extra weight and makes it simple , and they allow us enough time between rounds to allow the trans to cool.
Only once in 15 years did we even put a fan on the trans, it was in Vegas GoodGuys race where it was 120+° air temp.
Good Luck with your combo.
Jon