I had my first Utah heat summer with the biggest derale I could fit, 53406 34 Row.
I have a temperature gauge installed and really struggled to get it above 180 degrees all summer.
It holds almost an extra quart of fluid.
One of the best things I've done for the AT.
I'm running this one. Derale 53406 34 Row
I have a temp gauge installed and hardly ever get above 180 degrees. It holds an extra 3/4 of a quart of fluid, which is a big plus as well.
Don't use 6an stuff....
Definitely keep your radiator in line, it'll help cool plus it holds more ATF.