I went to use four wheel drive I moved slowly two feet and I heard a clunk clunk

I got stuck this winter and when I went to use four wheel drive I moved slowly two feet and I heard a clunk clunk but I got out of the spot I was stuck in I used it only one other time and now when I drive in 2wd I hear a clicking noise coming from the transfer case. I also noticed that it wont shift into 2wd so what I did is jacked up my driver side both tires and I put the truck into four wheel drive and when I let off the brake and idle it the two wheels on driver side moved when I put my brakes on I heard a clank noise coming from the transfer case almost like a grinding clank skip sound. So I got under the truck and checked the front drive shaft coming from the transfer case I moved it brake and forth and noticed that the sound of a click or slight clank came from it when I moved it back and forth. So any ideas or help in this matter would be greatly appreciated Thanks.