One problem related to rear suspension shock absorber has been reported for the 2004 Chevrolet Silverado. The most recently reported issues are listed below.
The problem started soon after I drove the new 2004 Chevrolet Silverado extended cab off the lot. When traveling between 60-70 mph, the trucks suspension will bounce almost as if there are no shock absorbers. This bouncing will continue until the speed is reduced to below 55 mph. I brought the truck in to the pittsburgh, CA dealer and complained. They said it was only a "California concrete highway" problem. They said it was the road and not the truck. I have this problem almost continually now, I complained to Chevrolet's customer complaint section, who gave me the same answer. The problem with their answer is that I own a 1996 Chevrolet Silverado extended cab truck that does not go into uncontrollable bouncing as this one does. I also drive a Chevrolet avalanche that does not bounce uncontrollably as this one does when driven at the same speeds on the same stretches of roadway. I believe there is either something wrong with the shock absorbers or the frame of the truck. The bouncing is so bad that it feels like the wheels are actually leaving the ground. I believe this is a serious safety issue that Chevrolet should address. My problem remains unresolved.