Shock Rear GM A/G Body 3C-4R

The AFCO Racing Products Shock Rear GM A/G Body 3C-4R is a monotube performance shock absorber engineered for GM A-body and G-body vehicles requiring precision suspension control. This 81-series rear shock delivers 13.97 inches of compressed travel and 19.27 inches of extended stroke, providing the geometric range necessary for both street suspension tuning and competition-level chassis setup. Built with a 1.50-inch outer diameter tube and black paint finish, this shock is designed to withstand the demanding environments of motorsports and high-performance driving.

The C3-R4 valve configuration is the critical differentiator in this shock's performance profile. The C3 compression damping and R4 rebound settings are calibrated to manage suspension energy under load while controlling chassis movement during unloading cycles. For users tuning A-body and G-body platforms—whether Chevrolet Novas, Chevelles, Pontiacs, or Oldsmobiles—this valve setup provides the adjustability window to dial in ride height control without sacrificing responsiveness. The monotube design eliminates the gas-charge pressure variations of twin-tube alternatives, maintaining consistent damping force across the full stroke envelope.

This rear shock serves serious bracket racers, street-strip drivers, and restoration builders who demand repeatable suspension geometry. The steel construction and controlled valve architecture make it equally suited for drag racing launch consistency and road-course corner stability. At 4.8 pounds, the unit integrates seamlessly into existing mounting points without adding unnecessary unsprung weight. AFCO Racing's focus on monotube shock technology across motorsports applications ensures this component reflects proven suspension engineering rather than generic aftermarket specification.