I would start off with a 4.1 to 1 transfer case gear set and see how you like it before doing to much to it, they are about 400.00 and do not require any grinding and should be great for medium duty wheeling and the freeway, as far as the diff gears go wait and see how you like the transfer case gears because if you go any lower than say a 4.62 with even a 33 inch tire you will be screaming the engine going down the freeway, some people like doing five grand down the road but not me!, and there is allot of Sammie owners that wish they did not make as many mods to their rigs as they did including me,the more weight you add to them the less they will do.