I do get the rattles in 4wd but they don't seem as loud as when I'm not in 4wd.
The sound is more of a tinkle tinkle rather than a clunk clunk. I don't notice the rattle when turning at all, it's mostly when going in a straight line and usually when backing off the acelerator or rolling down a rise etc.
I've filled the CV's with moly grease, lots of it. I did rebuild my front axle, new seals, bearings, oil and grease and so on.
Is there anything in the locks that could rattle???