South Bend Clutch Stage 4 Extreme Clutch Kit

The South Bend Clutch Stage 4 Extreme Clutch Kit represents the pinnacle of South Bend's performance clutch lineup — a race-engineered, build-to-order solution purpose-built for heavily modified vehicles that have exceeded the capacity of a Stage 3 clutch. Designed to handle the extreme demands of forced induction builds, nitrous applications, and high-output platforms, the Stage 4 Extreme delivers maximum torque transfer capability with the precision and reliability expected from a fourth-generation, family-owned American manufacturer.

Race-Engineered Pressure Plate

Every Stage 4 Extreme kit is built around South Bend's race-engineered pressure plate, precision balanced for vibration-free operation at elevated RPMs and modified for maximum plate load. The result is exceptional clamping force and superior holding power, delivering improved thermal stability and engagement dynamics when pushing a vehicle to its absolute limits.

Puck-Style Disc with Competition-Grade Friction Materials

The Stage 4 Extreme uses an aggressive puck-style disc design available in sprung and unsprung hub configurations to suit a range of drivetrain demands. Friction material options include sintered iron and graphite-impregnated ceramic — both engineered for maximum coefficient of friction and thermal resistance under drag, race, and rally conditions. Engagement characteristics are intentionally firm and abrupt, consistent with competition-level performance expectations.

Build-to-Order Precision

Because power levels and application requirements vary significantly at this stage, each kit is built to order with torque ratings calculated at the time of ordering. This ensures the clutch is properly matched to your specific application and power level — backed by South Bend's industry-leading warranty and decades of in-house manufacturing expertise.

Key Features:

• Top-tier, build-to-order clutch kit for power levels exceeding Stage 3 parameters
• Race-engineered pressure plate modified for maximum plate load and precision balance
• Puck-style disc available in sprung and unsprung hub configurations
• Friction material options: sintered iron and graphite-impregnated ceramic
• Higher clamp load for superior torque transfer and thermal stability
• Torque ratings calculated at time of ordering for application-specific fitment
• Kit includes throwout bearing, pilot bearing or bushing, and alignment tool where applicable
• SFI-approved single mass steel flywheel recommended for drag racing applications
• Manufactured in the USA under SFI-approved standards
• Some hydraulic systems may require upgrading for proper clutch separation

South Bend Clutch is a fourth-generation, family-owned American manufacturer with decades of hands-on clutch engineering experience. Every Stage 4 Extreme kit is manufactured, machined, and assembled in-house, ensuring consistent quality and uncompromising performance across the entire product line.