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If you pounded it out with a hammer the arm is probally shot.They are threaded thats why you need the socket.I would almost say the arm is bad anyway.Something had to be wrong with that arm to start with.They dont usually want to come out even with the socket.Rocky

I borrowed the socket to fit the other ball joint and it threaded out just fine.Compared the threads to the other upper control arm and didnt appear to be stripped.So I took the other ball joint and threaded it back into the control arm that I beat out.It tightened up just find without stripping out.