Extended Spring Cup w/ Jack Screw Sport Mod L/R

The Extended Spring Cup with Jack Screw Sport Mod L/R from WEHRS MACHINE is a precision suspension component engineered for short-track racing and bracket racing applications where adjustable preload and ride height control are critical. This left/right pair is designed to replace factory spring cups on Sport Mod chassis, allowing racers to dial in front-end geometry with accuracy that directly impacts cornering speed and tire contact patch. Whether you're fine-tuning a weekly circle-track competitor or preparing a show car with performance suspension, this extended cup design gives you the adjustment range needed to optimize your setup without frame modifications.

The jack screw mechanism integrates a threaded adjuster that allows you to raise or lower the spring seat incrementally, effectively changing vehicle ride height and load distribution in real time. This design eliminates the need for multiple spring rates or spacer stacks, letting you make adjustments trackside or in the shop pit without removing suspension components. WEHRS MACHINE's machined construction ensures zero play and repeatable geometry—critical when you're chasing lap times measured in tenths of a second. The extended cup profile also accommodates longer springs, which can improve suspension travel and stability through high-speed corners while maintaining proper coil binding clearance.

Sport Mod racers, bracket racers, and street/strip enthusiasts running independent front suspension will benefit most from this upgrade, especially those working with coil-over systems or modern suspension packages. Installation requires basic mechanical knowledge and typically involves removing the wheel, disconnecting the upper control arm or strut, and unbolting the old spring cup for direct bolt-in replacement. Verify your vehicle's coil spring diameter (usually 2.5" to 2.625" on modern applications) and upper mounting configuration before ordering to ensure compatibility with your specific chassis.