Asking about low friction ball joints reminds of the time I thought I needed the 5.0:1 ratio band apply lever for the 904 in my slant 6 Dart. Mopar Performance offered it, so I figured I needed it. Didn't know what it did, didn't know how it would help anything, wasn't having a problem that needed solving, but there it is and it fits my car so yeah, I needs it.