Upper Ball Joint - GM Large +.500

The QA1 Upper Ball Joint - GM Large +.500 (SKU QA11210-203B) is a greasable, take-apart upper ball joint engineered for high-performance suspension geometry in General Motors platforms requiring a +.500-inch oversize stud. This bolt-in replacement delivers low-friction articulation through QA1's precision manufacturing, making it the go-to choice for operators and enthusiasts building or maintaining suspension systems that demand reliability under load.

The 2.000-inch taper with a 4.35-inch stud height accommodates the large-bore GM upper control arm package, while the 1/2-20 thread specification ensures secure fastening with standard hardware. The greasable design allows field lubrication to extend joint life under extreme articulation—critical for off-road platforms, high-speed tactical mobility courses, or vehicles operating in sandy or salt-air environments where corrosion accelerates wear. Hardware is included, eliminating the need for separate fastener sourcing. At 1.91 lbs, the unit integrates seamlessly into existing suspension layouts without unexpected weight penalties.

This upper ball joint serves operators maintaining purpose-built vehicles, off-road enthusiasts rebuilding suspension geometry for improved articulation, and technicians upgrading aging OEM components. The bolt-in design minimizes downtime—no welding, no custom fabrication. QA1's reputation for low-friction bearing surfaces translates to tighter steering response and reduced NVH (noise, vibration, harshness) compared to worn factory joints, a measurable difference in high-speed operations where steering precision matters.

For General Motors platforms with large upper control arms and suspension geometry that requires the +.500 oversize stud configuration, this QA1 ball joint provides verified performance as a direct bolt-in replacement. Greasable construction, precision bearing surfaces, and included fasteners position it as the premium choice over economy alternatives that sacrifice articulation smoothness and service life.