On my rod I have a Mustang II front suspension and the drivers side lower ball joint failed. See the pic. It literally broke the shaft just below the theads. My car is extremely low and when it broke (slowly backing up from checking the air in the tires) the frame went to the ground. Luckily for me it didn't brake when I was actually driving on the road. Has anyone seen this before? I installed a new ball joint from NAPA, SKU 2601042. The new part says "hardened shaft". Hopefully that will not happen again. Another issue I am now having is the nut on top of the new ball joint doesn't tighten down low enough to get a cotter pin in. What's up with that?