Hey guys. This is my first post to the forum. Looks like there's a lot of knowledgeable techs on here. Anyways, I have a 2006 sierra 1500 4x4 4.8L 5 speed. Last week a clunking noise started coming from the left side tire/drive shaft. In the quick 1 min video Ill explain.

Rotating the tires did not do help the problem...but they were due anyways. After viewing the video I noticed the first drive shaft I shake (suspected problem side) makes a different noise than the opposing. Im almost sure the wheel hubs are fine..no play at all. What do you guys think?

Thanks, Ben