What is the oil weight you guys run in your Dana 70 rear axles? I have a sneaking suspicion that it potentially has never been changed, so I want to do so very soon. If it has ever been changed, it was probably 15-20 years ago. How do you tell if it's limited slip? Just put a synthetic with LS in it to be sure? Also, is the capacity the same on Fords as Dodge, etc? Dodge is the main info I'm finding online for Dana 70s.