The front lower ball joint. I can't get a wrench in there to tighten that nut. Spinning ball isn't an issue, just can't get a socket, or wrench over the nut due to the walls.
Remove the wheel
Remove the hub
Take out bottom shock bolt
Take out lower arm mount bolts
Lift lower arm up and out until axle end retracts through wheel bearing.
Spin lower arm 180 degrees, Remove lower ball joint castle nut with regular socket.
Note that lower ball joint is super tight, recommend at least a 12 ton hydraulic press to remove it. Just replaced all of mine last week.