While riding today my upper and lower a-arm came off. The upper a-arm pulled out from the bottom side exposing the ball and left the boot and flat round metal portion still on the upper a-arm. I looked on partsfish and other sites for the upper ball joint and they only show the castle nut for the upper a-arm. Can the upper ball joint be changed without buying a new a arm? This seems like it could possibly be dangerous. I just replaced the lower front ball joint along with a new nut and bolt and it still came out. Can anyone tell me the best way to fix the lower clamp so that it wont just slip out. Thanks

 

Mine has come loose once but I was able to torque it back down.

If the clamp for the lower ball joint isn't holding anymore, you may have to replace the whole spindle since the clamp is part of it.

The upper ball joint is replaced as a unit with the upper A-arm. I don't believe you can change just the upper ball joint.