I used the old Russell heat sink cooler, Mounted under the car close to the trans. Worked fine. No hoses strung all over the car. Able to be taken apart and cleaned. Moroso and some others sell heatsink style coolers.

Not for use on a street car. Drag race only. A car that regularly gets hot lapped may want to go to one of the units with it's own fan.

If the results don't match the theory, change the theory.