2020-2026 Duramax HD Upper Control Arm System (AXGMUCA20)

Factory upper control arms run out of travel and angle fast once a GM HD gets leveled or lifted. The Axiom Supply Upper Control Arm System fixes that with true double-shear arms welded from identical laser-cut 3/16" steel plates, corrected geometry, and a pair of AX6292 Grade 12.9 bolt-on upper ball joints already installed in the deal. Whether the truck is stock height, leveled, or fully lifted, this is the arm built for heavy-duty use.

Part Number: AXGMUCA20

• True double-shear construction: identical upper and lower 3/16" laser-cut steel plates, hand welded into one rigid structure
• Includes a pair of AX6292 Grade 12.9 bolt-on upper ball joints, among the strongest available for the GM HD platform
• Corrected geometry restores proper operating angles and improves droop travel on leveled and lifted trucks
• Dual-position ball joint mounting (above or below the plate) for extra alignment flexibility
• Improved grease fitting access keeps routine service simple in either arm orientation
• Premium bushings and sleeves for smooth articulation with minimal deflection
• Built to handle towing, oversized tires, lifted suspensions, off-road use, and daily driving

• (2) Axiom Supply Heavy-Duty Upper Control Arms
• (2) Axiom Supply AX6292 Grade 12.9 Bolt-On Upper Ball Joints
• (4) Control Arm Sleeves
• (8) Control Arm Bushings
• (1) Complete Installation Hardware Kit

• Designed for stock, leveled, and lifted applications.
• Compatible with most aftermarket suspension systems that use factory-style upper control arm mounting locations.
• Tires wider than 11.50" may contact the control arm with certain factory wheel configurations; additional wheel offset or spacers may be required.
• Apply 3 pumps of grease to each ball joint at install, then service every 5,000 to 7,000 miles. Do not over-grease.