2001-2010 GM HD Tubular Upper Control Arm Delta Joint Kit (ICO78550DJ)The ICON Vehicle Dynamics Tubular Upper Control Arm (UCA) Kit is a critical suspension upgrade for the 2001 2010 Chevrolet and GMC 2500HD 3500HD. These arms are engineered to correct front end geometry and caster after lifting or leveling, ensuring the vehicle can be properly aligned to maintain factory like handling. This kit replaces the weak factory ball joints with ICONs patented Delta Joint, providing significantly more articulation and nearly