i just found this thread.
i had the same exact thing happen on my car,
what a few people on here said to look for was the driveshaft bolts,
but it ended up being this bearing.
made the most horrible clunking noise anytime it was rolling,
its in the chevy garage as we speak getting fixed
should have it tomorrow or monday.
im freakin out without it,but at least ill be able to drive it normally