Rear axle cup stuck in tranny

It’s pretty basic, the axle cup is stuck in the trans. Tried to pull the whole axle, but nothing. Tried to pry it. Nothing. Used a 3 1/2 ft prybar on the exhaust clamp, nothing. Currently have an exhaust clamp and then attached a slide hammer. Went up to 45lbs on the hammer and the cup still won’t budge.

Any other ideas? It’s been soaking in PB blaster for a week now. What’s next, say the heck with the ring gear and plasma cut the cups out?