My XJ has a 5 spd, 4.0L, 33x10.50" BFG A/T KO, 4.56 gears. I drive plenty on the hwy at 65-70 mph, rpm is usually around 2500-2800. I'm convinced 4.56 is the correct gear ratio for my setup. I can haul a load, push a headwind, climb hills, pass other vehicles...all without any trouble. And it's...