So, I am trying to replace the CV axles on the X (3.0 if it matters).

I can not, for the life of me, get this axle nut off. I don't know if I've stripped the threads, if I haven't tapped the indents out enough, or I'm just lame.

Does anyone have any ideas here? If this nut is permanently attached to this axle, what else can I do to get it off?

I've tried an impact drill (rented from Home Depot), hammering on an 18 inch breaker bar, and pulling all the muscles in back trying to get it off.

If I have to drill it - how do I do that? Just drill around the edges until I can break some pieces of it off?

Thanks much.