Upper A Arm 8.5 Steel Offset Ball Joint Style

The U-B Machine Upper A Arm 8.5 Steel Offset Ball Joint Style (MPN 15-0829-6L) is a precision tubular control arm engineered for bolt-in installation on GM A-Body and G-Body platforms. This single upper arm delivers the geometric control and load-bearing reliability critical for suspension geometry tuning, whether for street duty, track application, or off-road recovery operations where arm deflection and compliance directly impact vehicle handling and longevity.

The 8.5-inch length with 1.5-inch offset geometry is calibrated to restore or modify suspension kinematics on second-generation A and G-body chassis. Steel construction with black powder-coat finish provides corrosion resistance in varied environments—essential for vehicles exposed to salt spray, high humidity, or extended storage. The ball joint design allows for precise angle adjustment and load distribution, critical parameters when diagnosing or correcting camber, caster, and ride height specifications. At 3.8 pounds, the arm maintains structural rigidity without unnecessary mass penalty.

This component is suited for experienced builders, suspension technicians, and enthusiasts performing restoration, geometry correction, or performance tuning on classic and muscle car platforms. Proper installation requires accurate torque specification and alignment verification post-installation. The ball joint interface requires appropriate greasing intervals and inspection for wear, standard maintenance on any suspension arm in active service. Compatibility is confirmed for GM A-Body (Chevelle, GTO, Cutlass) and G-Body (Monte Carlo, El Camino, Regal) platforms from the specified model range.