70 Challenger with Dana & green bearings.
Started hearing some noise coming from rear of car. Sounds like a rhythmic rubbing/grinding type noise.
I can see signs of some gear lube leaking around axle seal.

Did the seal just go bad, or did the seal start leaking bcause the bearng gave out?

Lastly, what's the worst case scenario? Was hoping to make to the Garlits show this wknd, ok to drive?

Can't really hear sound with car in drive on Jack stands, might be my imagination, but rotating wheel seems "out of round"