I have a similar setup, 37's w/5.13's but manual tranny. At 75 mph in 6th I am at 3000 rpm. To keep up with traffic on the long trips to CA I am commonly at 3300 rpm's for extended periods of about 2 hrs at a time. By then one of the kids or the Mrs. has to have a restroom break.
The Jeep seems to travel pretty nicely at 80 mph with the long arms now in place. It's just the mileage that seems to get exponentially worse the faster I travel.
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