if you're gonna do that , you could just either A: buy a 4:1 kit for your 231. B: find a 241OR off a rubi and swap it, or C: buy a 300, flip it, buy 4:1 , and make shifters and stuff, or D: buy an atlas. id wheel for a while and look for a 241OR personally. the 300flip/231 doubler adds up fast, or even just a flipped dana 300. i researched this for days a while ago. i decided to keep the 231 until i can afford an atlas.