Lift the front wheels off the ground (and set the front end on stands), and turn it slowly by hand. You should be able to feel it if it's that bad. You might even be able to see it on the drive axle in the form of a visible "click". Not sure how to describe it better than that.
Find a big open space, and accelerate then decelerate while holding the wheel firmly all the way left, then all the way right. The sounds should change, depending on which way you're turning. You don't need to hit any great speeds, just put some stress on it. If they do, CV.