Ok here is what i'm running and what I want to accomplish. 98XJ, 3.5in RE, 31's, auto, np231, d30, 8.25, stock 3.55's. I cant decide to ear gear to 4.11 or 4.56's. My XJ is my DD I would like to keep running at 70 mph and not be racing over 3000 RPM's. I do pull some times 2500 lbs max. So...