If it was a "clicking" sound, it's probably your hubs. I've had mine make noise in situations like that. Just keep an eye on them as lots of wheelers have been known to blow the stock hubs, especially with larger tires.
However, if was a very loud "clanking" sound, that's your front diff slipping and eating itself. The two sounds are orders of magnitude different in noise level. So if it's a clicking, I wouldn't worry too much, but if its a really loud clanking, and the hairs on your neck stand up, then you might have some major probs on the way.