Rear End Clicking
 

So... Just today: after accelerating from a stop my rear end clicks, after about 15 the clicking stops and at 40 the front hums and my part time light *sorta* lights up. When I engage 4WD all of it clicks. I just replaced the 4WD sensor two weeks ago. I'm thinking transfer case but I'm not sure. Anything I could check or what you guys think it is?