If you can get someone breaking a 4wd 46 or 4610 and get all the parts out of the same tractor all you need to do is put it together and the gearing will be right for 13.6 x 36 rear and 11.2 x 24 front. If not and you buy bits from different tractors you might need to put different tyre combinations on to get gearing right cos as boohoo says there is different ratio axles and drop boxes. Whoever said about ford axles wearing the castings must have been feared of the grease gun! Ford never made axles they were carraro axles which were fitted to more than just fords. Get the bits and get her converted! What cab's on her?