if its a click that corresponds more or less with the wheel rotation on one side its possible you cracked a hub...I did the same thing a few years ago. The hub would still put power to the wheel, but wouldnt lock in all the way and clicked every time the front left wheel went around. it was replaced under warranty and no problems since.

the stock hubs are fairly sturdy (enough for most peoples uses) and i was really pushing it (front end hopped while attempting a hill climb, and came down with the wheel spinning a bit too fast) when mine went. I heard a really loud POP and thought, shit, ive blown a hub and I am never going to get out of here....but it kept on putting power down so I drove on it the rest of the day. When I blew an auto hub in my fullsize bronco I was stuck a good distance from any traction at all (texas mud) and had to keep the one rear wheel spinning at about 40 to keep my momentum up enough to get back to the "road." the point of all of this is that I was very impressed by the Nissan hub's ability to get me home, even though it was apparently hurting.