Hays Steel SFI Certified Flexplate

1960–1971 Chrysler 300 / 1995–1998 Dodge B1500 / 1970–1974 Dodge Challenger / 1966–1976 Dodge Charger / 1987–2004 Dodge Dakota / 1974–2001 Dodge Ramcharger

40-518

Overview:

The Hays Steel SFI Certified Flexplate is engineered to provide a reliable and precise connection between Gen III Hemi engines and a variety of transmissions including the 727, 904, A500, and A518. Designed to eliminate the need for crankshaft spacers, this flexplate ensures proper engine-to-transmission alignment, allowing the use of stock-type torque converters with attached ring gears. Ideal for muscle car restorations, performance builds, and classic truck upgrades, it offers durability and peace of mind for enthusiasts seeking a high-quality drivetrain component.

Whether you’re upgrading a classic Chrysler 300, Dodge Charger, Challenger, or modern Dodge trucks like the Dakota or Ramcharger, this flexplate meets the demands of high-stall torque converters and high horsepower applications without compromising reliability.

Key Features:

Designed with precision and durability in mind, the Hays Steel Flexplate offers the following standout features:

• SFI 29.1 Certified: Meets stringent safety standards required for many racing classes.
• Direct Fitment: Connects Gen III Hemi engines to 727, 904, A500, and A518 transmissions without crankshaft spacers.
• Heavy-Duty Construction: Made from 0.105” thick Grade 80 steel to resist cracking and withstand high stress.
• Corrosion Resistance: Zinc-dichromate plated finish protects against rust and corrosion for long-lasting performance.
• Optimized Design: CAD engineered for precise fit and reliable operation under demanding conditions.
• Torque Converter Compatibility: Designed for use with 7/16” torque converter bolts.
• Dual Bolt Circle: Features a 10.0" dual bolt pattern to accommodate both symmetrical and asymmetrical configurations.

Construction & Design:

The flexplate is crafted from premium Grade 80 steel with a thickness of 0.105 inches, providing exceptional strength and resistance to flex or cracking near the crankshaft flange. This robust material selection ensures the flexplate can handle the torque and stress generated by high-stall torque converters and powerful engines. The zinc-dichromate plating adds a protective layer against corrosion, extending the life of the component even in harsh environments.

Every flexplate is computer-aided designed (CAD) to guarantee precise dimensions and optimal performance, ensuring smooth engagement and reliable power transfer between the engine and transmission.

Installation & Fitment:

Installation is straightforward for experienced mechanics and performance enthusiasts. The flexplate bolts directly to the Gen III Hemi crankshaft and transmission bellhousing without the need for crankshaft spacers, simplifying the setup and maintaining correct alignment. It is compatible with stock-type torque converters using 7/16” bolts, making it a direct replacement or upgrade for a wide range of classic and late-model Dodge and Chrysler vehicles.

Fitment includes:

• Chrysler 300 (1960–1971)
• Dodge B1500 (1995–1998)
• Dodge Challenger (1970–1974)
• Dodge Charger (1966–1976)
• Dodge Dakota (1987–2004)
• Dodge Ramcharger (1974–2001)

What's Included:

• One Hays Steel SFI Certified Flexplate (Part #40-518)

Ideal For:

This flexplate is perfect for automotive enthusiasts, restorers, and racers who require a durable, SFI-certified flexplate for connecting Gen III Hemi engines to classic and late-model Dodge and Chrysler transmissions. It is especially suited for high-performance builds involving high-stall torque converters and engines producing elevated horsepower levels, ensuring reliable drivetrain operation under demanding 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.