How do you remove a stuck front wheel hub?

I have a 93 Aerostar and I am replacing the front penger side hub. it is AWD. I have had problem after problem. I managed to get the rotor off, and remove the three bolts holding the steering/hub in place. I had to use a 5 lb sledge to remove the stuck on rotor. and now guess whats stuck. The hub will not budge...... I somehow managed to pound the hub into two pieces. the "wheel" part is now off but the rear part that actually bolts to the van is still stuck on. I have tried to wedge many screwdrivers between the two and no luck... I have WD40d the hell out of it and now it is soaking... What else can I do to remove the hub?