One problem related to suspension noise has been reported for the 1999 Chevrolet Silverado. The most recently reported issues are listed below.
I was driving to my home from work when I noticed an excessive knocking sound coming from the front of the truck. I pulled into my driveway looked at the front suspension and around both tires. That's when I saw that the passenger side front upper shock mount had broken free from the frame. The shock was just banging freely against the frame. The truck is 15 years old so I know its not under warranty, but that's just poor construction. The truck has been my daily driver and has never been offroad. Judging from the other complaints regarding the frame cracking and/or breaking that I've read, I'm assuming gm isn't going to do anything about it. It's just sad. Regardless, I think NHTSA should issue a recall because this is a safety concern. The excess bounce can cause the driver to lose control of the vehicle.