So...it looks like I begin a re-ring. As long as it is apart I guess I should fix the front trans seal leak and maybe a shift kit. Then service the rear end.
Or...I could re-ring a 340 challenger engine I have laying around, rebuild the 727 that goes with it with shift kit, and swap out the rear for an 8 3/4 sure grip I have that has nothing to do. Hate to dismantle a bone stock Dart, but stuff happens.