[Captainfab]

On the '63-'66 C20's I do not know for sure if the '73-'87 lower ball joint will press into the '63-'66 lower control arm. I have never tried it. In the past I have just changed the entire front suspension. Also on the '63-'66 C20's, you can not just change to the '73-'87 lower control arms.The '63-'66 lower control arm shafts are flat where they bolt to the crossmember and consequently do not have the saddles required for the round shafts found in the '73-'87 lower control arms. The '73-'87 C30 dually spindles are different than the C20 spindles since the calipers are different. I believe the C20 tierods are larger than the C10 tierods so I do not think the aftermarket aluminum adapter sleeves will work. I have always just used the entire later model steering linkage.