It took 2 weeks of Kroil and a torch to get mine off. They are on a spline and become very attached.
The other technique is to pull the complete axle. Remove the inside dust cover, pull the bolt and remove the shims. Remove the final drive oil pan, loosen the large nut on the bull gear, and use a brass drift to drive the axle out until you can turn the inner nut all the way off. Once the axle is out you can heat and beat the shaft out of the wheel center.