Re: massive clunk/knock noise
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.
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