Here's the post. So I used a 1-1/8" impact deep socket and when placing on the arm, I made sure it wasn't touching the cone washer. I then took a big swing, retrieved the socket and repeated. The first one came out on the first swing, but the other two took 3 or 4 big swings each. One thing I noticed is that the washers were popped up a little higher (they didn't just fall out), and at that point I could work them out with some pliers. Once I had the cone washers sitting on the floor, I was able to use a smaller hammer and "gently" work the arm off the knuckle.
http://67-72chevytrucks.com/vboard/s...54&postcount=9