At least you got it apart.
I've got a spare final drive with a bent axle, and I wanted to remove the axle to have it straightened. After a fair amount of various penetrating oils, heat, and time, some even pneumatic, it didn't budge and has been sitting under a shop bench for several years. I looked at it yesterday, and still not even going to bother with it.
It's going to be one of those things I'll have to put in a large press, and when it finally lets go, there'll probably be parts flying everywhere like an explosion. Everything I put back together on these, get copious amount of anti seize grease.
The final drives on these seem be pretty tough, but things like replacing the rear brakes, often ends up being like your experience. Not a well thought out design for servicing.