I suggest a puller fan, meaning it's mounted inside of the engine bay between the rad and the engine. They are more efficient as stated and cool better. As to what fans to use, I'm not sure, measure your rad and look through junk yards to see what fits. I have used Ford Taurus Fans, 95ish year on s10's with the 4.3 and they work great! But it may not fit the wrangler. You can buy a cheap thermostat at autozone for $17, I've had mine for two years now.