I have a ford 1715. A little while back I changed the rear tires from a 13.6x16 to a 12.4x16 to get a r-4 tread pattern. The fronts are 25x8.50-14. To achieve the correct drive ratio for the 4x4 would the 25x8.50-14 be ok when I change to the r-4 patten for the fronts or do I need to go to a...