I don't really run my truck in 4wd on the road or at faster speeds very often, but I was yesterday and today with the snow. Anyways, I hadn't noticed it before, but now I'm getting a vibration and noise that sounds like it is coming from the t-case when I'm in 4wd, and I'd like to figure out what is making the noise before it becomes a big deal. The 4wd still works, it just kinda vibrates a lot and is pretty noisy (more than normal) when engaged. It also takes a while longer to come out of 4wd, and usually clunks pretty hard when it does. I'm thinking possibly a bad output bearing or something like that. What do you guys think??? Anything obvious to check for???