4130 Upper Control Arms

The Dirt King 4130 Upper Control Arms offer a significant upgrade for off-road enthusiasts seeking more travel, control, and confidence. They are built with a 4130 chromoly construction and professionally MIG welded to ensure structural integrity for aggressive driving and rugged terrain. Key components include the Probearing Pro 4 Series Ball Joints, which provide 38° of articulation and feature an induction-hardened ball stud for maximum strength and a smoother steering feel. The arms are geometry-corrected, improving caster and pivot angles to enhance handling and control with up to 3 inches of lift. They also provide an approximate inch of additional down travel compared to stock, making them ideal for pairing with aftermarket coilover shocks. These upper control arms are preassembled for a quicker, hassle-free installation. They are also fully rebuildable, with all wear items replaceable for long-term reliability. Corrosion-resistant finishes, including zinc-plated hardware and a black powder coat, help protect against the elements. The arms are proudly made in the USA. Compatibility includes 2003-2024 Toyota 4Runner (2WD/4WD), 2007-2014 Toyota FJ Cruiser (2WD/4WD), 2003-2009 Lexus GX470 (4WD), and 2010-2023 Lexus GX460 (4WD). It is important to note that these control arms provide maximum down travel and must be paired with aftermarket coilover shocks; they are compatible with various brands including Dirt King, King, Fox, Bilstein, ADS, Icon, and Eibach. A specific note advises against installing with coil spacers combined with extended-length aftermarket shocks. As with all suspension modifications, ensuring prompt wheel alignment is critical after installation. The manufacturer also provides a disclaimer that suspension modifications can change vehicle dynamics and stability characteristics, and the customer assumes all liability for correct installation, maintenance, and non-modification of parts.