I'm sure it's been thought of on here, but what are the upper and lower ball joint differences between 79-83 and 84-95? Upper / Lower control arms? Since they are the same basic design, what changed? The interchange thread kinda died, so just wondering. Looking at the pics of the parts, they don't seem that different. I'm wondering if a set of '84 ball joints could be swapped onto an '83 and drop spindles for an '84-'95 could be used? I'm sure someone has done the research on this, it's as easy as comparing the ball joints and the mounting face. If the bolt holes match up, then it's a piece of cake. I'm guessing they don't. Any idea?