Ford Bronco Zone Early Bronco Classic FullSize Broncos: Ford Bronco Zone Early Bronco Classic FullSize Broncos -> Please help transfer case trans rearend problem ?

Hi any input or help ? I would be so greatfull ! 
Ok I have a 1994 bronco xlt automatic push bttn 4x4. 5.8 - 1356 electric transfer case  

Here is my problem : 

when I'm at a complete stop , and start to drive (Frorward or reverse )I feel light bump or knock. In drive it reminds me of a broken motor mount or loose part moving into place. I can feel a thump right at the trasfer case area and can see it move up and down a bit when it does it. Also if start off slow it will not do it , only if you step on it a bit.
When I come to a complete stop it does it again , but when in nutral and I stop it does not do it. 
Now once I'm up to speed it drives fine no problems. It will shift hard at times . It feels like the body is loose from the frame and or motor but all bushings are good .

Also in nutral I can turn the drive line about a 1/2 turn or so By hand and I do hear some clicking in the tcase, is that normal ? 

Both the 4x4 and Low range lights on the dash work and both ingage ok. But there is some clunks . Breaks, ujoints, bushings look good. This truck has 138,000 on it it's very clean and no other problems so far.