Just a quick video showing you one way to get a Rear Disc off when it is rusted to the axle. This works in many occasions but may not work when there is extreme rust or corrosion. This is a general-vehicle video.
How to repair, install, fix, change or replace broken, snapped, rusted, frayed or cut tail gate cables or strapson 03, 04, 05, 06, 07, and 08 Ford Super Duty F250 and F350 models.