The only specialized tool that I used was a ball joint fork. Other than that, I used a hammer and a large socket (as posted above) to remove the lower balljoint from the hub. There's a metal ring on the inside of the spindle that needs to come out, but will pop off when a flathead is used on it. With that off, you can see how the balljoint comes out.

The upper 2 in the A arm are not replaceable and you must replace the whole A arm to get new upper balljoints.

hih