Is this the part you are refering to? If so, it is the pitman arm. I think it is what you are refering to. If so, you need a ball joint spliter. It looks like a big fork. Once the cotter pin and nut are off, place the splitter between the pitman arm and the drag link and smack it with a heavy hammar. It will come apart. I have also included a general picture that I found listing all the parts of the front end. Let me know if it is something different.
Let me know if this helps.
Tuesday, August 3rd, 2010 AT 10:25 PM