Samurai, the four-pole 1406 will run cooler. I have had up to a 88/21 gearing on mine on a hot summer day with temps not close enough to worry about. The 19 is what I run for all-around driving on 3s and heat has never been even close to a problem and the truck gets into the low 50's.
I've parked the storm until spring. Its too cold for grip with the 2wd.