Transmission Cooler/Cooler lines

The only question mark.........and is only because it hasn't been tested..........is the check valve........

But then again, even if the check valve failed. there wouldn't be enough leakage through the pump to cause any kind a pressure drop to the converter.

The thing i like best about your design is that you don't need extra lines and two cooler.
one fan driven oil cooler is all you need.