Spec Clutch SJ631 Stage 1 Performance Clutch Kit

The Spec Clutch SJ631 Stage 1 Clutch Kit is a high-performance, street-friendly upgrade engineered for drivers who demand more from their drivetrain without sacrificing daily drivability. Featuring a 349 ft-lb torque capacity and a near-stock pedal feel, this kit delivers a noticeable improvement in clamping force and clutch longevity over OEM units.

At the heart of this kit is an integrally molded carbon Kevlar-based, high-performance organic lining that provides smooth, predictable engagement and extended service life. The lining is bonded to a steel backing that maintains structural integrity under high clamp loads and elevated temperatures. The hub is double-sprung with spring cover reliefs, allowing for drivetrain flexibility while heat-treated internal components ensure long-term strength and durability.

Key Features:

• High-clamp pressure plate for increased torque capacity over stock
• Carbon Kevlar-based organic lining for smooth engagement and extended life
• Integrally bonded steel-backed disc for strength under heat and load
• Multi-compound woven organic disc material
• Double-sprung, high-torque hub and disc assembly
• Heat-treated components for added strength and durability
• 11-inch disc diameter with 10-spline input shaft interface
• Includes bearing and installation tool kit
• Made in the USA

Ideal Driving Applications: Street, Drag, Drift, Road Race, Rally, Pulling, Autocross

The Spec SJ631 Stage 1 is the ideal entry-level performance clutch for street-driven vehicles that occasionally see track or off-road use. It retains a stock-like pedal feel while providing the added clamp load needed to support modified engines and increased drivetrain demands.