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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 richk:
Mine began making occasional weird noises after only 500 miles. Now I am just over 2k and it keeps getting worse (cluncking/vibration/etc). If the deterioration keeps it current pace it may not be driveable in about 3-4 weeks. </div></BLOCKQUOTE>

Contrary to what you have just been told, if your rear end is making a noise, and it can be verified by the technician, the Service Manager does not have to file a report to order the part. Can't say how long it would take to get the part, since that would be GM Service Parts and I do not work for them. What I just read by another poster would make me think that they will not cover this under warranty unless they get approval, and this is not correct.
All warranty repairs are handled under a one-on-one basis, and they will not order a part unless they can verify a problem. They will also not take the rear cover off to see if you have the problem....UNLESS it is launched as a Service Campaign (aka Recall). At which point, you would be notified by mail, and the dealer would perform an inspection and/or replace the rear end. But the numbers are so small there is no need for a campaign.

However, when a part fails under warranty, no extra paper work is required to order the part. The extra paper work and report might be requested by Technical Assistance in Grand Blanc, Service Engineering in Warren, MI or by the supplier, but if a part fails under warranty, it is covered and will "eventually" be replaced.

Warranty data is showing a greater number coming in sooner than 3K. The earlier the failure, the greater the amount of grit, is correct.