thanks jon, well, i purchased the r200 used and slapped on the obx, i just cant figure out the pinion depth with out some kind of tool. proform cant be used on our diffs according to proform, im curious on what MikeC used, i also found a universal tool from powerhouse around $190 and central tools universal tool which can range from $540 to $740 . hopefully i can get MikeC's input on which tool he used or maybe a good shim size to start off with and then i can play the guessing game with multiple times of assembling and disassembling to get the right gear pattern. Feels like i am down to those two options