Spec Clutch SD853F Stage 3 Plus Performance Clutch Kit

The Spec Clutch SD853F Stage 3 Plus is the flagship single-disc performance clutch kit designed for heavily modified street and race engines that demand more torque capacity than a standard Stage 3 can deliver. Built around a carbon semi-metallic full-faced friction disc, this kit delivers an exceptional balance of high torque holding power, long friction life, and surprisingly civil daily drivability — making it a top choice for high-output builds that still see regular street use.

At the heart of the Stage 3+ is a high-clamp pressure plate paired with a double-sprung hub featuring spring cover reliefs for added flexibility and heat-treated components for long-term strength and durability. The full-faced carbon semi-metallic material provides superior friction coefficient, wear resistance, and engagement feel compared to puck-style discs, all in a single package.

Kit Includes:

• High-clamp performance pressure plate
• Full-faced carbon semi-metallic friction disc
• High-torque sprung hub and disc assembly
• Release bearing
• Installation tool kit
• Flywheel (included per spec listing)

Key Specifications:

• Disc Diameter: 8.875 in.
• Input Shaft Diameter: 0.938 in.
• Input Spline Count: 17
• Clutch Disc Quantity: 1
• UPC: 841802115444

Intended Driving Applications:

• Street / Daily Performance
• Drag Racing
• Drifting
• Road Racing
• Rally
• Pulling
• Autocross

Spec Clutch designs and manufactures all of its clutch kits and flywheels in-house at its purpose-built facility in Bessemer, Alabama, maintaining tight machining tolerances and full quality control from design through production.