Useful information

Here are some of the addresses/ websites that I think might be helpful:

List of trucks officially affected:

Chevy Avalanche         1999-2003
Chevy Silverado            1999-2003
Chevy Suburban            1999-2003
GMC Sierra                   1999-2003
GMC Tahoe                   1999-2003
GMC Yukon                  1999-2003


http://www.nhtsa.gov/  
This is the website for the National Highway Traffic Safety Administration. This is the first place you should go to file a formal complaint. You can also look up the investigation that was done on GMC and see all correspondents to and from GMC. You can also look up all information for the Toyota Tundra recall.

NHTSA address:             NHTSA Headquarters
                                        1200 New Jersey Avenue, SE
                                        West Building
                                        Washington, DC 20590