1996 Jeep Grand Cherekee - (Kokomo In. in Kokomo, IN

I have a 1996 Front drive shaft from my old truck. The ball yolk is completely gone on the shaft, however, "Thrifty" auto on Washington St here in Kokomo didn't TELL me that before they put 400 dollars worth of U Joints on the shaft. I took the shaft off shortly after the U Joints were put on because another shop told me that the ball yolk was g