[dave2953]

The ball joints are the same diameter, but the shaft that has the threads on it is different IIRC. I did my swap from an '89 burb but I used the control arms, tie rods, center link, etc from the burb...basically everything except the crossmember. You should just be able to put the ball joints for the 80 into the existing 68 arms, and install spindles. As mentioned, you would need to get the ball joints and center link from the donor vehicle. I'm not sure that anyone makes an outer tie rod for a 73-87 that would adapt to your 68 inners, but someone else might know.