A-Arm Slug 3/16

The A-Arm Slug 3/16 from JOES RACING PRODUCTS is a precision control arm caster slug engineered for racers and suspension tuners who demand geometry adjustability. This compact aluminum slug serves as a shim that alters caster angle on slotted upper control arms, allowing drivers to fine-tune front-end handling characteristics without replacing entire suspension components. Whether you're dialing in a road-race setup, preparing for autocross competition, or optimizing daily-driven performance vehicles, this slug gives you critical adjustability where it matters most.

Machined from durable aluminum and finished in black anodized coating, the A-Arm Slug 3/16 features a 1/2-inch inner diameter hole for secure mounting on slotted upper control arm pivot points. The 3/16-inch offset creates measurable caster changes that improve steering feel, stability under cornering loads, and brake dive behavior. Its minimal weight of just 0.03 pounds ensures zero penalty to unsprung mass while delivering repeatable, predictable geometry shifts. The compact 3 x 0.15 x 3.75-inch profile fits seamlessly within tight upper A-frame locations, making installation straightforward for experienced suspension builders without requiring frame modifications or exotic fabrication.

This slug pairs directly with JOES RACING PRODUCTS slotted upper control arms, making it ideal for track-focused builds, competition vehicles, and enthusiasts running adjustable suspension platforms. Installation requires removal of the upper A-arm and positioning of the slug at the pivot hole—a task well within the scope of any home mechanic with basic suspension knowledge. Multiple slugs of varying offsets allow stacked configurations for greater geometry flexibility. Buy the A-Arm Slug 3/16 as part of a comprehensive caster adjustment strategy, and unlock the handling refinement that separates competitive setups from stock geometry.