I'd have to agree with Jerry if there's a snap ring holding the inner bearing race in place, it would take more than a few colorful vocabulary words to get at that snap ring with the hub still in place. Why GM might have decided that snap ring was necessary is beyond me other than keeping the wheel in place if the nut happened to come loose on the outer bearing and prevent the wheel, hub and axle from coming out of the axle housing while going down the road. Pretty unlikely occurrence. Even so, the pull harder comment would apply, but it would take more than Jerry's chain "whiplash" to pull the hub off the seal. A jack behind that chain bolted to a couple of lugs and bearing on the axle tube would do the trick.
