Low Friction B/J Upper Bolt-In + 3/8in

The Low Friction B/J Upper Bolt-In + 3/8in from ALLSTAR PERFORMANCE is a precision greasable ball joint assembly engineered for high-performance suspension builds and race-oriented vehicle modifications. Whether you're building a dedicated track car, competition drag platform, or upgrading a street rod chassis, this upper ball joint delivers the durability and adjustability serious enthusiasts demand. The 3/8-inch configuration matches common aftermarket control arm packages, making it a direct bolt-in solution for builders standardizing on proven suspension geometry.

This ball joint features ALLSTAR's low-friction design, which reduces bind during full-articulation suspension travel while maintaining precise steering feel and cornering response. The greasable construction allows field maintenance without component removal—a practical advantage during multi-day events or frequent setup tuning. The 3/8-inch stud diameter provides robust load capacity while the upper bolt-in mounting integrates seamlessly with both stock and custom upper control arms. Precision manufacturing tolerances ensure consistent bearing preload, eliminating slop that compromises handling predictability under aggressive driving conditions.

Suspension builders, drag racers, and road-course competitors rely on this component for reliability across thousands of heat cycles and repeated load reversals. The assembly suits vintage muscle car restorations, modern performance platforms, and custom chassis projects where frame-mounted upper control arms use 3/8-inch ball joint studs. Installation requires standard hand tools and basic mechanical competency—verify control arm bore diameter matches 3/8-inch specification before ordering. At 1.82 lbs and compact 5.5 x 2.9 x 9.05-inch dimensions, this ball joint integrates cleanly into space-constrained engine bays without clearance complications.