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If you are down to just the rtv holding it on try a small Sharp chisel & a hammer, lightly tap the chisel between the cover & the diff. On my 76 I can usually use the cross member to pull the cover.
Yes its just being held by rtv. I am trying to cautious, dont want to break anything while replacing the cover.
I can slam it with a sledge hammer and a chisel, just wasnt sure how much it would take to break he gask sealer without breaking the cover.