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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by H3Lady:
I found out today what the cause was - workers on the line did not wash out the sand cast rear cases and sand is in the case eating at the bearings. It take milage to make the noise. Over 3K to be exact...Mine is effected along with a lot of early production models. I will have to replace ours as well. </div></BLOCKQUOTE>

Unless there are two faults, Hummertech posted the correct cause yesterday in another thread.

Hummertech posted this information:
"The problem with the rear ends is simple and it could be in any vehicle with any optiions. The problem is this, the supplier that supplies the axles for GM had a batch of them go out that did not have the lapping compound cleaned off the gears. This compound is gritty, and after a thousand miles will chew up the bearings some.
It is all covered under warranty, no easy way to tell if yours is affected or not without just driving it and seeing if a noise develops.
Sorry but some of you will have the trouble of having to get this fixed. Many will not. At least it's not a design flaw or something more serious. Just an idiot at the GM supplier."

This was confirmed as the problem before I even read the thread from Hummertech. The problem can come a lot earlier than 3K miles. Some have failed at 1K.