Mercury Differential

[RalphG]

Its looking (sounding) like my "new' 53 Merc might have a differential problem. I'd noticed slightly unusual sounds when pushing the car around before. So I jacked it up, removed left rear wheel . It turns ok but there is some bad sounds and I can't be sure if its in the brake drum or differential. Haven't been able to get the drum off yet and just hoping the problem is in there. Wheel bearing seems fine and without play. That drum is sure stuck on the hub though. Bigger hammer?