Ditto on all the forgoing. Here's a link to RevMax for a bypass kit:
https://revmaxconverters.com/produc...-8hp75-transmission-cooler-thermostat-bypass/
With this install, you'll have three options:
Option One: Install warmer blocking plate only. This will get rid of the immediate unneeded heating of the transmission fluid. This will cause the transmission to run about 20 degrees cooler all the time and not heat up so quickly.
Option Two: Remove thermostatic valve only. Remove the plastic end plug which is notorious for cracking and leaking. Install the new brass end plug and omit the factory thermostat. This option will cause the unit to heat up quickly but run at a slightly lower temperature.
Option Three (Most Common): Install the warmer blocking plate and brass endplug upgrade and remove the thermostat. This will eliminate the rapid heating from the warming unit and then by also removing the thermostat you can expect up to a 50-70 degree drop in operating temperature. You will also have a 87% increase in cooler low by using this option as the restrictive thermostat is now removed and the maximum amount of cooler flow is now flowing.
I used option three above and my temps are now running well more than 35 degrees lower than before. In addition, nearly all of the controlled airflow louvers behind the grill were removed, a new aluminum oil pan and filter were installed and the transmission flushed with fresh Valvoline MaxLife fluid. It all worked as advertised and better than expected.