Shock Rear GM Metric 9 Comp / 1 Reb

The Shock Rear GM Metric 9 Comp / 1 Reb is a monotube rear shock designed for GM A-Body, F-Body, and G-Body vehicles. Built with SMX Series engineering and a C9-R1 valve configuration, this rear shock delivers controlled compression and rebound tuning for vehicles requiring metric-thread applications. The steel construction with black paint finish provides durability and corrosion resistance for street, strip, and road-course duty.

The 9 compression / 1 rebound valve setup is tuned for vehicles running mild to moderate suspension upgrades. A 9-stage compression valve slows fluid flow during bump absorption, preventing bottoming while maintaining compliance over road imperfections. The single-stage rebound circuit allows faster extension, keeping the tire in contact with the pavement and supporting consistent handling geometry. At 26.75 inches in length and 4.35 pounds, this shock meets OEM mounting dimensions for direct bolt-on installation without modification or fabrication.

This rear shock serves restoration, performance upgrade, and daily-driver applications across the GM A-Body (Chevelle, Malibu), F-Body (Camaro, Firebird), and G-Body (Regal, Cutlass) platforms. Vehicle owners upgrading from worn original shocks or switching from lowering springs to coil-over suspensions will find the C9-R1 valve package a practical middle-ground option. The metric thread design ensures compatibility with modern metric fastener standards common to these platforms.

Monotube shocks offer improved heat dissipation and consistent performance under repeated cycles compared to twin-tube designs, making them reliable for both street and weekend track use. The SMX Series platform is recognized in the GM performance community for delivering straightforward damping without excessive complexity, allowing buyers to focus on matching compression and rebound ratios to their specific suspension geometry and driving style.