I bought my truck in Aug 2015 and noticed a quaking (yes, quacking, the service writer laughed too until he heard it) sound when I push the brake to go from park to reverse or drive at about 4K miles. Same sound going into park. The dealership told me what it was. They replaced the shift interlock and told me it was a characteristic of the part. I call bs on that being as it didn't quack when I bought it. In my opinion, if it didn't quack when I bought it, it shouldn't quack at all. I bought a truck, not a duck.