Adj Lower Ball Joint Screw-In w/Large GM Pin

The Adj Lower Ball Joint Screw-In w/Large GM Pin by Allstar Performance is a precision suspension component engineered for street rods, performance builds, and classic muscle car restorations where aftermarket control arm geometry demands a modern, adjustable ball joint solution. This screw-in design allows shops and enthusiasts to dial in exact ride height and suspension geometry without replacing the entire control arm assembly. Whether you're lowering a Chevy, Pontiac, or Oldsmobile frame for a show car or fine-tuning wheel alignment on a competition vehicle, this ball joint delivers the adjustability and durability needed for serious suspension work.

Built with a robust threaded body and large GM pin interface, the Allstar screw-in ball joint accepts standard lower control arm housings without modification, making installation straightforward for experienced technicians. The adjustable design permits ride height correction and suspension geometry tuning post-assembly—critical when chasing perfect caster, camber, and king-pin inclination angles. The large pin specification ensures compatibility with original GM suspension architecture while the screw-in mounting system maintains structural integrity under cornering loads and bump impacts. Heat-treated steel construction and precision bearing surfaces minimize play and extend service life under track or aggressive street duty.

This component is ideal for vintage Chevrolet, Pontiac, and Oldsmobile platforms running custom control arms or fabricated front end geometry. Installation requires basic suspension knowledge and hand tools; proper torque specifications and cotter pin retention are essential for safety-critical longevity. Verify control arm bore diameter and pin size before purchase to confirm compatibility with your specific build. Paired with quality bushings, springs, and dampers, the adjustable lower ball joint becomes a cornerstone of predictable, tunable suspension geometry for street rods, restorations, and vintage performance vehicles.