[Synchro909]

chrs, if you are talking about original steel drums, they are very difficult to machine. They squeal and chatter terribly.
If you're talking about the rear hubs for a wheel bearing repair, they are hard at the diff end and as soft as cheese at the outer end. Ford's hardening process here left a bit to be desired. That said, they did last for a surprisingly long time. If they were hardened properly, we would never need to repair them even after all this time and who knows how many miles. From Ford's perspective in the day, that would have been overkill.