Kryptonite ball joints and traction bars.
I decided to change my ball joints so I went with the Kryptonite brand. They have a lifetime warranty. While I was at it I added Procomp traction bars. This was a little difficult because I wanted to keep my Firestone airbags. The airbag bracket uses u-bolts and clamps around the lift block and axle. The Procomp brackets go under the lift block and on top of the axle. So I ended up fabricating the airbag brackets to work with the traction bar brackets. I did have to weld the airbag bracket to the Procomp bracket on top. The ball joints ran $180 and traction bars were $480.