Which line off the radiator goes to cooler?
Out of the transmission---> Into the stock cooler---> Out of the stock cooler---> Into the aftermarket cooler---> Out of the aftermarket cooler---> Back into the transmission.
That setup will give you the best cooling possibile. How you have it now is not "pointless", but if you have it going into your aftermarket cooler first and then into the stock cooler, you're not getting as much cooling as you could be. The radiator ends up heating the fluid back up some on the way through....






