steering wheel shaft

My steering wheel shaft, on my 67 Barracuda, has so much play at the connection to the steering box,
it is starting to feel unsafe. where can I take it to repair. ?? Constantly trying to keep it going straight.. **( Perhaps I am saying it wrong. The steering box was replaced, the problem seems to be where the two pieces of the steering wheel rod connect in the engine bay. It looks like a slot where the two pieces connect has about a 1/4 inch of play.)