Today coming from church, I heard a screech/grind coming from the rear end. I was maybe 1/4 mile from my house, so I drove it home. Disconnected the driveshaft, and it turned with great difficulty. Pulled drums off, threw the tire back on to help turn it, and it still turns hard.
This is an 8 3/4 which I thought were indestructible

wondering what should I look for when it comes apart?

Any common problems? This is my only ride, and I kind of want to get parts before I pull it apart.