That is the inner race for the inside bearing. They should only be a light interference fit. You should be able to pull that off. Try a puller or a couple screw drivers prying at the same time. If worst comes to worst, cut across the face in a couple places with a die grinder and break it into two pieces.
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1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.