Hays Steel SFI Certified Heavy Duty Flexplate

2005–2019 Chrysler 300 / 2005–2019 Dodge Challenger / Charger / 2005–2008 Dodge Magnum

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Overview:

The Hays Steel SFI Certified Heavy Duty Flexplate is engineered specifically for Gen III Hemi engines found in select Chrysler and Dodge vehicles. This flexplate is designed to endure the demanding conditions of high-stall torque converters and high-RPM operation, making it an essential upgrade for enthusiasts and professionals seeking enhanced durability and reliability. Unlike factory stock flexplates that are prone to cracking under extreme torque and RPM, the Hays heavy-duty flexplate offers superior strength and longevity.

Ideal for use with NAG1, ZF 8HP70, and 8HP90 transmissions, this flexplate ensures seamless compatibility and performance. It is a perfect choice for owners of Chrysler 300 (2005–2019), Dodge Challenger (2008–2019), Dodge Challenger SRT (2011–2018), Dodge Challenger SRT Hellcat (2015–2019), Dodge Charger (2006–2019), Dodge Charger SRT Hellcat (2015–2019), and Dodge Magnum (2005–2008) models equipped with an 8-bolt crankshaft.

Key Features:

Designed to meet the rigorous demands of high-performance applications, the Hays Heavy Duty Flexplate offers the following key features:

• SFI 29.1 Certified: Meets stringent safety standards for racing and high-performance use.
• Heavy Duty Steel Construction: Thicker than stock steel plate resists cracking and deformation under stress.
• Corrosion Resistant Finish: Zinc dichromate plating protects against rust and maintains a clean appearance.
• Securely Welded Ring Gear: Ensures reliable engagement with the starter motor for consistent starts.
• Transmission Compatibility: Designed for NAG1, ZF 8HP70, and 8HP90 transmissions for broad application.
• Internally Balanced: Optimized for smooth operation and reduced vibration.
• 8-Bolt Crankshaft Fitment: Specifically engineered for vehicles with 8-bolt crankshafts.
• Not Compatible with Ram Truck or Jeep Grand Cherokee: Intended for select Chrysler and Dodge models only.

Construction & Design:

The Hays Heavy Duty Flexplate is crafted from a thicker steel plate than factory stock units, providing enhanced strength to withstand the extreme forces generated by high-stall torque converters and elevated engine speeds. The flexplate’s ring gear is precision welded to ensure durability and reliable starter engagement. To combat corrosion and extend service life, the entire assembly is finished with a zinc dichromate plating that offers excellent resistance to rust and environmental wear.

Its internal balance design reduces vibration and contributes to smoother driveline operation, which is critical for maintaining drivetrain integrity under demanding conditions. This robust construction makes it an ideal upgrade for performance builds and heavy-duty street or track applications.

Installation & Fitment:

Installation of the Hays Heavy Duty Flexplate is straightforward for experienced mechanics and professionals familiar with Gen III Hemi engines and compatible transmissions. It is designed to bolt directly to the 8-bolt crankshaft without modification. The flexplate fits Chrysler 300 models from 2005 through 2019, Dodge Challenger models from 2008 through 2019 including SRT and Hellcat variants, Dodge Charger models from 2006 through 2019 including SRT Hellcat versions, and Dodge Magnum models from 2005 through 2008.

Note that this flexplate is not compatible with Ram Truck or Jeep Grand Cherokee models. Proper torque specifications and alignment procedures should be followed during installation to ensure optimal performance and longevity.

What's Included:

• One Hays Heavy Duty Flexplate with welded ring gear

Ideal For:

This heavy-duty flexplate is ideal for performance enthusiasts, racers, and professional builders upgrading or maintaining Gen III Hemi-powered Chrysler and Dodge vehicles. It is especially suited for applications involving high-stall torque converters, high-RPM operation, and those requiring a durable, SFI-certified flexplate for safety and reliability under extreme conditions.

Hays delivers drivetrain performance parts—clutches, flywheels, flexplates, and related components—built to handle the street/strip life. It’s a trusted name for muscle and performance builds where stronger holding power, consistent engagement, and durability under aggressive launches matter.