Designed explicitly for Trucks with Factory Cast Steel Control Arms: These upper control arms are engineered to be compatible with trucks equipped with factory-cast steel control arms. Improved Strength: Enjoy enhanced durability and rigidity thanks to the fully welded plate steel construction. Precision Machined Ball Joint Cup: The CNC machined ball joint cup provides improved positioning making it ideal for use with leveling/lift kits. High-Quality Greaseable Ball Joints: Benefit from reliable performance with high-quality greaseable ball joints with a protective cap to protect from dirt and debris. OE Style Rubber Bushings: Experience maintenance-free operation and long-lasting durability thanks to the OE style rubber bushings. Ready to Install: These upper control arms come fully assembled and are prepared for hassle-free installation.