Good luck...as I stated in your other thread though I don't think it's a fluid problem. Your clutches are starting to bind up. A little 'chatter' going around turns is okay, usually from a more aggressive preload setup on the clutch plates, but pops/snaps/bangs are not, especially if the noise just started. Been there done that....more than once. I sincerely hope you find something catching or binding in the suspension components, but your symptoms are all too familiar. In your other thread you also stated it's the 'stock Dana'; does that mean the diff unit is going on 50 years? In that case it's probably past due for a rebuild anyway..