[NC67Chev]

I decided to go ahead and replace ball joints while I was installing disc brakes. When I put the spindle one the passenger side, I notice that it seated really deep. I just decided to move forward and with the drivers side and come back and torque everything later. When I torqued it (I followed the Moog instructions of 55 ft/lbs for the upper) it seated so deep that I had to use a washer in order to get the cotter pin to mesh with the castle nut. The other new upper seemed to seat correctly. I knew something wasn't right, so I decided to take it apart and look at it this evening. As soon as I unbolted it, the ball joint separated, so it was basically just sitting in there. I tested one of the old ones and it seated just fine. Thoughts? Wrong ball joint?