Extended Spring Cup w/ Jack Screw

The WEHRS MACHINE Extended Spring Cup with Jack Screw (model WM304S-11) is a rear suspension component designed for high-performance sport modified applications. This bolt-on upper spring cup accommodates 5-inch coil springs and features an integrated jack bolt for precise ride-height adjustment and suspension tuning. It is ideal for drivers looking to optimize their vehicle's handling and launch characteristics in competitive environments.

Constructed from hardened steel with a durable black paint finish, this component is engineered to withstand the load cycles common in drag racing, circle track, and street performance vehicles. The design allows for easy integration into existing suspension architectures without frame modification. The included jack screw enables incremental spring preload adjustment, which is critical for tuners who need to fine-tune roll stiffness, corner weight, and ride height without disassembling the suspension.

This component serves drag racers, circle-track competitors, and street performance builders who require adjustable suspension geometry. The steel construction with a corrosion-resistant finish maintains structural integrity across repeated heat cycles and high-G loading events typical of competitive motorsports. At 3.97 lbs, it carries minimal unsprung weight while delivering the rigidity required for consistent performance.