My daughter’s 2006 has rear discs.
Saint Cad says in post #14 that it has disc rear brakes. My 2001 E250 has disc rear, also.
Yah, that’s why I was asking if he was sure. Loose drum brakes chatter when backing up. I’ve also suffered from the dreaded rear disk parking brake cable disease. But that didn’t make any noise, it just dragged .