I think it would be better to have dual cases and have 1 of the 2 cases be geared with 4.7s so you front driveline isn't 4 feet long. with duals and my axle 4" forward mine is 36" already. And with a dual ultimate you get a 223 to 1 crawl ratio and with triples 246 to 1, and if you already got duals a gear set is cheaper than another case and adapter.