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Randy pretty much hit it on the head. On one mine, I did have a heck of a time getting the old ball joint out, though. I didn't have a pickling fork and had to resort to using a pulley puller that I clamped to the ball joint housing with the shaft of the puller on the ball joint thread. Leave the old nut partially on to guide the shaft. The other ball joint was a lot easier, I just backed the nut off of the old ball joint, set the assembly in the vice with ball joint shaft pointing up, and whacked the end of the ball joint shaft with a BMF hammer and it popped right out.
As far as torqueing down the new ball joint, I also don't have an impact gun, so I used 2 pieces of 2x4 with a hole drilled near the end of one of them that would allow my 19mm socket to fit through it. I put the new ball joint in the housing with the shaft of the new ball joint sticking through the hole in the 2x4, and put the other piece of 2x4 on the backside of the ball joint assembly. Putting the other ends of the wood into my vice so that the 2 pieces of 2x4 looked like a "V" with the top of the "V" holding the ball joint assembly. Tightening the vice put enough pressure on the mating surfaces that I was able to crank the ball joint nut down with no problem.
When I reassembled everything, I had to wedge a piece of wood (yeah, I've got a lot of wood lying around) between the a-arm and the frame of the car to push the arm down to get everything to align again.
One of these days I've got to get some air tools.
Good luck
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