I've replaced almost the entire truck except c.v. joints, differentials and the driver side wheelbearing, the front driver side makes a clicking in reverse more pronounced when turning,off the line in drive if I give it a lil gas there's a loud bang that seems to come from below the 4 wheel shifter ,and if I put it in 4 wheel n turn the banging gets real bad.the c.v.s look new... any ideas would be apreciated

 

Check universal joints.

 

sounds like the cv joints. my 85 s10 would bang like crazy in 4wd even with new cv joints, but yeah turning the wheel they start banging