Spec Clutch ST854-2 Stage 4 Performance Clutch Kit

The Spec Clutch ST854-2 Stage 4 Clutch Kit is a race-focused, high-torque clutch system engineered for heavily modified engines where maximum clamping force, instant engagement, and reduced rotating mass are critical. With a rated torque capacity of 369 ft-lbs, this kit is built to handle the demands of competitive motorsport applications.

The Stage 4 is a solid hub evolution of the Stage 3, featuring a rigid 8-rivet solid hub with a heat-treated disc and carrier assembly for exceptional strength and durability under race conditions. The high-clamp pressure plate works in concert with your choice of carbon-graphite semi-metallic friction disc in a 3, 4, or 6 puck configuration, allowing you to tune engagement characteristics to your specific application.

Puck Configuration Guide:

• 3-Puck — Lightest option, most aggressive engagement, ideal for maximum weight reduction
• 4-Puck — Balanced compromise between engagement feel and weight savings
• 6-Puck — Smoothest engagement of the three; marginally street-drivable but not street-friendly due to the rigid hub design

Key Features:

• High-clamp performance pressure plate for maximum torque transfer
• Carbon-graphite semi-metallic friction material for durability under race heat cycles
• Solid 8-rivet rigid hub — heat treated for strength
• Available in 3, 4, or 6 puck configurations
• Torque capacity: 369 ft-lbs (measured at flywheel)
• Includes release bearing and installation tool kit
• SFI approved

Recommended Driving Applications: Drag Racing, Drifting, Road Racing, Rallye, Pulling, Circle Track

Note: The Stage 4 is a race-only clutch. It is not recommended for street driving due to the rigid hub design and aggressive engagement characteristics. For street/strip use, consider the Stage 3 or Stage 3+ kits.