Spec Clutch SZ134 Stage 4 Performance Clutch Kit

The Spec Clutch SZ134 Stage 4 Clutch Kit is a high-torque, competition-grade clutch system built for drivers who demand maximum holding power and durability. Designed as a solid hub evolution of the Stage 3, the Stage 4 features an 8-rivet solid hub disc assembly that is heat-treated for superior strength under extreme load conditions.

The kit is available in 3-puck, 4-puck, and 6-puck configurations to suit your specific performance needs. The 3-puck disc offers the lightest rotating mass, ideal for applications where quick throttle response is the priority. The 6-puck configuration delivers the smoothest engagement of the three and is the only configuration suitable for limited street use. The 4-puck strikes a balance between the two, making it a versatile all-around choice for mixed-use applications.

Due to its rigid solid hub design, the Stage 4 is not considered street-friendly and is best suited for dedicated performance and motorsport use. It excels in drag racing, road racing, tractor pulling, rallye, and drift applications where a firm, direct power transfer is essential.

Key Features:

• Solid 8-rivet hub — heat-treated for high-torque strength and long-term durability
• High clamp pressure plate — maximizes clamping force for aggressive power transfer
• Carbon-Graphite friction material — engineered for consistent performance under high heat and repeated use
• Available in 3, 4, or 6-puck disc configurations — select the setup that matches your driving style and use case
• Includes bearing and installation tool kit — everything needed for a complete clutch service

Ideal driving applications include drag racing, road racing, tractor pulling, rallye, autocross, and drift. Limited street use is possible in the 6-puck configuration, though the rigid hub should be considered when evaluating daily drivability.