FWIW---

As of Jan 30, 2006 GM has gone back to greasing shafts only and no longer replacing them . Took my truck in this morning to find this out. Luckily, they were out of grease and they have a few shafts on the shelf and are replacing the unit as we speak. There were 4 other tahoes and trucks that were in the service bay at 8am this morning with the same issue.

The service manager tried to tell me that the service did not cover 4wd models until I made him look like a fool in front of everyone in the service dept.