small ball joint vs big

There is very little force on the upper ball joints. I re-used them on my 65 Dart and 64 Valiant since still tight, though I did remove them to better paint the UCA and added poly boots.

I know of 3 lower ball joints - 9" drum, 10" drum and K-H disks, later disks. I know one can't use the (cheaper) 73+ disk ones on a 65 10" drum spindle, since I tried.

The main wear concern I know of is the bearings in the 9" drum hubs. Both outer bearings spun the race in my 69 Dart, even though I kept them greased and adjusted. I have heard similar stories.