One problem related to suspension torsion bar has been reported for the 2004 Chevrolet Silverado. The most recently reported issues are listed below.
While driving 25 mph the torsion bar on the front broke. This caused the right front to drop and loss of steering control. Vehicle was tow to a repair shop. Dealer and manufacturer were notified. Torsion bar adjuster broke on the left front and then lost control and went off driveway into trees causing substantial damage to suspension and frame.