massive clunk/knock noise

[Killer]

I had this same noise / issue and confirmed that it was the front diff bracket. I obtained the part number from my local Hummer dealer (50 miles away) and ordered the part from my local Chevy dealer ($75.00). Once it came in (2-days) had it changed by a friend of mine who owns an automitive shop. The entire fix cost me $291.00 and guess what? No more noise!! My H3 is back up to 100%.

ps - My front diff had no issues and no damage which was a good thing because my H3 has 74K miles and is still going strong.