A-Arm Slug 1/8

The A-Arm Slug 1/8 is a precision caster adjustment component designed for serious suspension tuning on vehicles equipped with slotted upper control arms. Built for enthusiasts and professional mechanics who demand precise geometry control, this aluminum slug enables fine-tuned caster angles without the expense or complexity of replacement arms. Whether you're dialing in a street performance build, preparing for autocross competition, or fine-tuning factory suspension geometry, the A-Arm Slug 1/8 delivers the adjustability that modern chassis setup requires.

Manufactured from black anodized aluminum, this control arm slug features a 1/2-inch ID hole designed to interface with Joe's Slotted Upper Control Arms and compatible aftermarket systems. The 1/8-inch offset geometry provides incremental caster adjustment, allowing you to shift the steering axis inclination without modifying ball joint angles or suspension geometry in unintended ways. The anodized finish protects against corrosion while maintaining a professional appearance under the vehicle. Precision machining ensures consistent fit and repeatable results across suspension adjustments, critical for anyone serious about repeatability and performance data logging.

This slug is essential for builders working with Joe's Slotted Upper Control Arms or compatible systems that employ modular offset adjusters. Installation requires removing the upper control arm, positioning the slug in the slotted mounting hole, and retightening fasteners—a straightforward job for anyone with basic suspension knowledge. The lightweight design (0.03 lbs) ensures negligible unsprung weight penalty while providing the adjustment range needed for aggressive camber and caster curves. Buy the A-Arm Slug 1/8 if you're committed to suspension geometry precision and need OEM-quality adjusters for your control arm setup.