Rear driveshafts, 6 spd to auto. Both 4 dr, both 4 wd, both dana 44 rear ends. 6 spd is from a rubie the auto is a X (different transfer cases ? ). Want to pick up a spare rear driveshaft, just want to know if the 6 spd would fit the auto. I know the pt# are different but that doesn't mean it won't work. Thanks