I believe he can do that for you with no problem, though it will obviously require a core charge. I know that when he and I were going back and forth on the new design stuff (to deal with line clearance issues) he used one of his cores so that we could have them cross in the mail to save time. I also had the same issue, so I shipped him my 4WD box and had him install a new output shaft when he made the mods. Just another option…