Spec GM F40 Aluminum Flywheel

SKU: CSCLS4AF40

SPEC GM F40 Aluminum Flywheel for LS4 Engine Swaps

The SPEC GM F40 Aluminum Flywheel, a precision-crafted component that delivers consistent power transfer and rapid engine response in high-performance builds. Built from high-grade billet aluminum, this flywheel minimizes rotational inertia to enable quicker acceleration and sharper shifts, making it the reliable option for enthusiasts tackling road courses, drag strips, drift events, or daily-driven swaps. Compared to standard steel flywheels, the SCLS4AF40 cuts weight while maintaining structural integrity under extreme loads, ensuring smoother operation and longer component life across demanding applications.

Key Features and Performance Advantages

• Lightweight Billet Aluminum Construction: Reduces overall drivetrain mass for faster rev-matching and enhanced throttle feel, ideal for modified setups where every ounce counts.
• .001-Inch Machining Tolerance: Guarantees a perfectly flat clutch seating surface and flawless balance, promoting even wear and vibration-free performance.
• Diamond-Ground Friction Surface: Provides secure clutch engagement without slippage, even in high-torque scenarios.
• SFI-Certified Design: Meets rigorous safety standards for racing and street use, with proven durability in autocross, pulling, and rally conditions.

This flywheel stands out in LS4 swap projects by pairing seamlessly with the GM F40 6-speed transmission, offering a direct bolt-on solution that outperforms heavier alternatives in responsiveness and efficiency. Racers and builders choose the SCLS4AF40 for its track-tested reliability and ability to handle increased horsepower without compromise.

Vehicle Fitment Details

The SCLS4AF40 is designed specifically for custom engine swaps requiring adapted components. Compatible applications include:

• GM LS4 Engines (5.3L V8): 1999-2024 models, including those from Chevrolet Trailblazer SS, GMC Envoy Denali, Saab 9-7X Aero, and Isuzu Ascender, when mated to:
• G6 F40 6-speed gearbox (found in Pontiac Solstice GXP, Saturn Sky, or similar GM platforms).
• Saab F40 6-speed gearbox (from Saab 9-2X, 9-3 models).
• Requires custom bellhousing, starter, and pilot bearing adaptations for recessed flywheel installations in non-stock configurations.

Verify exact compatibility with your build via the manufacturer’s application guide, as this flywheel supports a range of GM V8 swaps to F40 transmissions.

What’s Included in Your Purchase

• One (1) SPEC SCLS4AF40 billet aluminum flywheel.
• Integrated diamond-ground friction plate surface.
• Self-locking fasteners for secure installation.
• Comprehensive installation instructions (digital download available upon request).

Part Number: SCLS4AF40

Shipping and Packaging Information

• Part Weight: Approximately 18-22 lbs.
• Shipping Box Dimensions: 14″ x 14″ x 6″.

Upgrade your LS4-to-F40 swap with the SCLS4AF40 order today for immediate gains in drivability and power delivery. Backed by SPEC Clutch’s reputation for quality components trusted by professionals worldwide.