1973 Duster Build

I think it was that you need big ball joint upper control arms. I had to slap some small ball joint uppers on it to get it to move, and the only spindles I had were those drum brake ones off my Challenger conv. Those spindles use the big ball joint. My guess is you will be installing disc brakes anyway. You can either get some A body big ball joint upper control arms, or get 2 of Dr. Diff's sleeves to use the small ball joint in a big ball joint spindle.