29' bumper pull travel trailer, I am going to add an external cooler and the new thermostat I believe. Just made me real nervous when I started seeing trans temps in the 220's and never got lower than about 196
Have a 2016 GMC Sierra 1500 with the 6L80E (6-speed) transmission), had a new/rebuilt transmission installed about 6 months ago. Anyway, here in Oklahoma and trans temps average around 195 degrees in the summer but when towing they increase significally, was thinking about adding an external trans cooler but now wondering if I just need to replace this thermostat with the cooler one? Thoughts?