I currently regeared my TJ from 3.07s to 4.10s, still on 31s and have the 3 spd auto. Going 70 I'm at 3100 rpm. It's a little high but will be better when I go to 33s. Gas mileage hasn't suffered too much, went from 15 to 14 mpg.
But, it's way too much fun around town. The dang thing runs like a scalded dog.
"Anything to do with the land, I love."
"So it's probably eighty percent luck and twenty percent skill."
I never could figure what the sky was thinking, but the soil, she don't keep too many secrets.