back when I was a ford tech, this wasn't uncommon. the '97-up expedition was the worst offender. the inside of the rotor hat would rust up and fuse to the outside edge of the hub. I would use a rose bud around the outside of the hat (not the face where the studs go though). then, a little gentle persuasion with the 4lb. hammer and they were off, with no ill effects on the bearing or hub. "the better idea people" strike again.
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