Shock Rear GM A/G Body 4C-4R

The AFCO Racing Products Shock Rear GM A/G Body 4C-4R is a purpose-built monotube shock absorber engineered for high-performance suspension tuning on General Motors A-Body and G-Body vehicles. Designed for serious enthusiasts and track-focused builders, this rear shock delivers the damping control and durability needed to handle aggressive driving conditions, road course work, and competitive motorsport applications. Whether you're upgrading a classic muscle car or fine-tuning a street performance build, this shock provides the foundation for predictable, responsive chassis behavior.

Built as a monotube design with a C4-R4 valve configuration, the Shock Rear GM A/G Body 4C-4R operates with 13.97 inches compressed and extends to 19.27 inches, offering a 5.3-inch stroke suitable for controlled suspension travel. The 1.50-inch outer diameter steel body is finished in durable black paint to resist corrosion and wear. The C4-R4 valve strategy—combining compression and rebound damping circuits—allows independent tuning of suspension stiffness, making this shock ideal for builders who demand precision control over bump absorption and return characteristics. At 4.83 pounds per unit, the compact 28.65-inch overall length integrates cleanly into most chassis configurations without interference or packaging compromises.

This rear shock is engineered specifically for GM A-Body platforms (Chevelle, Cutlass, Skylark) and G-Body applications (Regal, Monte Carlo, Grand Prix), making it an exact-fit replacement or upgrade for original suspension components. Installation is straightforward with standard mounting provisions; however, proper spring rate selection and alignment setup are essential to maximize performance benefits. Builders planning comprehensive suspension upgrades should pair this rear shock with matched front units and progressive spring rates calibrated to their vehicle weight, driving style, and intended use. AFCO Racing's engineering heritage ensures this shock meets the demands of both weekend warriors and dedicated track competitors seeking repeatable, fade-resistant suspension performance.