You definitely got a flatland Jeep. I have yet to check to see what my wife's axle ratio is, but it seemed to do OK in 6th when the 32s were on (got a second set of wheels and put stock size tires on for the non-white season).
I don't know of any shops in Denver other than Bear Frame and Axle that could do a gear swap. Maybe Drive Train Industries in Aurora. If you do decide to change the gearing, may as well get a set of lockers while you are at it. Don't want to have to do it twice - go big or go home.
Me - STAY AWAY FROM BIG-O on Arapahoe & (east of Peoria). Not real bright over there.