Transmission/4wheel drive
GM issued a safety bulletin concerning a "CLUNK SOUND' as related to the transfer case for 4 wheel drive systems. The bulletin states the problem and states the noise is not a problem and the situation will not affect performance, however mine is getting worse and affecting performance, My question is has been noted that this is a manufacturer's defect, the cost of replacing the transfer case should be borne by the manufacturer. How do I get redress?