Our 8spd transmissions are known to run hot regardless, and if you're towing and/or hauling heavy, they can get even hotter. As I'm sure you know, heat kills transmissions
Plus, the existing thermostat valve in the transmission cooler is a known issue and if it seizes you'll cook your transmission.
@caulk04 is a highly respected member of this community, and his designed trans cooler bypass valve is fantastic. I have one, my stepdaughter has one, my buddy has one, too. We all immediately got the benefits of the reduced trans temps.
Many on in this community utilize his product and have nothing but great things to say about its benefits.
Reach out to him and he will get you sorted