Upgrade Your Chevelle, GTO, Skylark, or Cutlass With Our Billet Aluminum A-Body Upper Control Arms – GP-X Series

If you're building a serious pro touring or time attack A-body—like a Chevelle, GTO, Cutlass, or Skylark—you already know the factory suspension geometry is holding you back. Our GP-X Series billet upper control arms are designed to eliminate those limitations and elevate your front-end performance to an elite level. Crafted from CNC-machined 6061-T6 aluminum, these arms combine aerospace-grade precision with functional adjustability to deliver sharper handling, superior grip, and the ability to dial in your suspension exactly how you want it.

Elite Geometry. Infinite Adjustability.

The GP-X billet upper control arms dramatically improve front suspension geometry by increasing positive caster, enhancing camber gain, and elevating front roll center height. The result: quicker turn-in, higher cornering grip, and enhanced stability during hard braking and transitions.

Each arm features:

• CNC-Machined 6061-T6 Billet Aluminum Construction – Lightweight, rigid, and corrosion resistant

• Built-In Arm Length Adjustability – Fine-tune your alignment and geometry without shims
  

• Rod End Outer Pivots – Provide low-friction movement and zero-deflection articulation under load

Quick-Set Caster Adjustment – Zero Shims Required

Our Quick-Set cross shaft system uses indexed slugs to adjust caster quickly and accurately—without disturbing camber or requiring a stack of shims. It’s the fast, clean, and repeatable way to tune front-end behavior for the street or track.

Choose the Right Ball Joints for Your Application

GP-X upper control arms are compatible with either Proforged or Howe ball joints to match your intended use:

• Proforged – Best for high-end street builds and spirited driving

• Howe – Ideal for autocross, track days, and full competition setups

You can also choose from multiple ball joint heights for proper geometry correction:

• Stock Height – Use with tall spindles like our GP-X AFX Drop Spindle

• +.5" or +.9" Tall – Improve camber gain and roll center with factory spindles
  

GP-X Series: Innovation Without Limits

The GP-X Series is the pinnacle of design and technology at Gorman Performance Engineering; an elite line of components crafted from exotic materials like billet aluminum, advanced composites, and aerospace-grade alloys. Engineered for those who demand the absolute best, GP-X parts blend art and science to deliver ultra-high performance with show-stopping aesthetics.

Every GP-X component is a statement: lightweight, precise, and unapologetically advanced. Whether it’s pushing the envelope on the track or setting a new standard in craftsmanship at the show, GP-X is where form meets function in its most refined and radical form.

For visionaries, perfectionists, and performance purists, the GP-X Series is where brilliance becomes reality.

Complete Your Suspension System

Pair your GP-X upper arms with other premium Gorman Performance components to complete your A-body’s transformation:

• GP-X Drop Spindle – Optimize front-end geometry and stance with adjustable ball joint height and C6/C7 brake compatibility

• GP-R Lower Control Arms – Chromoly strength with precision articulation

• GP-R Front Sway Bar – Tighten transitions and reduce body roll

All GP-X products are proudly built to order in the USA. Please allow 1–2 weeks for production and shipping.