1998 Dodge Ram balljoint nut removal

I am trying to remove the ball joint nut to remove and replace the steering knuckle and I cant seem to get the nut to break loose the whole joint spins when I try to loosen it. Would it be better iff I wedge a pickle fork in between the axle and knuckle the keep the joint from spining while trying to break the nut loose, I dont want to damage the thread because the joint is still good unfortunately the hub bearing went out while I was driving it in 4 wheel and took a huge chunk out of the knuckle alomost cutting into the hub screw. So know I need to replace the steering knuckle and hub and cant get the old one off because the bottom balljoint spins while trying to break the nut loose. Please help I am at a loss and am over worked so time really isnt an option in this winter season thank you