My 2005 Sierra has started to ride strangely. Only 24000 miles, out of town for a few months so haven't taken it back to dealer yet. Bought truck newin July '05 for it's smooth ride. When rolling over even the smallest "bumps" or rises in concrete, it sounds and feels like I hit something big. The rear of the truck reverberates for a few seconds, hard to describe, but kinda like twanging a saw blade.Bed makes noise when closing the doors, extended cab.Tires are good but factory issue and at least one is out of round since I had them balanced twice in last 10000 miles and still shakes a little around 60 mph.. Tire pressure at 32 psi all around.Checked suspension and it all seems intact.Anybody else experience anything like this?

 

not seen that...better hit your dealer

 

have you checked your torsion bars probably the prob