I did it

. I tried a pipe on a bar...that didn't work and I was afraid I would snap something again. So I tried the heat and ice trick that Barry mentioned and then used the breaker bar and pipe....CRACK. It came loose.
Interestingly there was lubricant on the threads after I took the nut out. I'm guessing this was from the Liquid Wrench I used. I'm thinking that when I put it back together I will torque it less and apply some anti-seize before I wrench it down. The threads appear to be in fine shape.
Thanks everyone for your suggestions.