So, if you were switching gears from a 3.73 in an Excursion with the V-10, would you go right to 4.56 or 4.30? Gas mileage is not a concern, and it's in a 2WD.
Remember the OP is in relative flat lands compared to us on the West Coast. We just made a loop from the Pacific coast to MN and WI in July and my fuel mileage was better than any of my more local trips due to less elevation climbs. This was why I suggested the 4.30 over 4.56 ratio for his application.