Upper A Arm 9 Steel Ball Joint Plate Style

The Upper A Arm 9 Steel Ball Joint Plate Style (MPN 15-0902) from U-B MACHINE is a critical suspension component engineered for vehicle platforms requiring precision front-end geometry control. Whether you're restoring a classic hot rod, building a competition suspension, or maintaining factory alignment specs, this upper control arm assembly directly impacts steering response, tire wear patterns, and overall chassis dynamics. The ball joint plate design allows for precise camber and caster adjustments—adjustments that separate a vehicle handling like a sports car from one that wanders and pulls to one side.

Constructed from hardened steel, this upper A arm features a nine-position ball joint plate configuration that provides multiple mounting options for fine-tuning suspension geometry without requiring expensive fabrication. The plate-style design eliminates the need for shims, offering a repeatable, adjustable solution that serious mechanics prefer for its durability and tunability. At 4.04 lbs and measuring 12.1 x 1.3 x 14.35 inches, the component balances strength-to-weight ratio while maintaining the structural rigidity needed under acceleration, braking, and cornering loads. This design minimizes deflection and maintains consistent suspension kinematics through aggressive driving or heavy hauling.

Ideal for street machines, off-road builds, and vintage restorations, this upper control arm works best when paired with matching lower arms, quality ball joints, and a professional alignment to maximize tire life and handling predictability. Installation requires basic suspension knowledge and standard hand tools, though a wheel alignment following installation is non-negotiable for safety and performance. Builders and mechanics who understand suspension geometry recognize this plate-style upper A arm as a versatile solution for platforms where factory geometry may be outdated or where custom tuning demands a more adjustable approach than traditional fixed-geometry arms.