Choosing the Right Differential and Axles for Your Miata Ls Swap to Handle 500+ Hp

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When it comes to swapping an LS engine into a Mazda Miata, one of the most critical components to consider is the differential and axles. Achieving reliable performance with over 500 horsepower requires careful selection to ensure that your drivetrain can handle the power without failure.

Understanding the Basics

The differential is a vital component that allows the wheels to rotate at different speeds while turning. It is crucial for handling, traction, and overall performance. Axles connect the differential to the wheels and must also be chosen wisely to handle high power levels.

Key Considerations for Differential Selection

  • Power Rating: Ensure the differential can handle at least 500 hp.
  • Type: Choose between open, limited-slip, or locking differentials.
  • Gear Ratio: Select a ratio that complements your engine’s power band.
  • Fitment: Ensure compatibility with your Miata’s chassis.

Power Rating

Differentials come with varying power ratings. For an LS swap producing 500+ hp, consider options rated for higher power outputs, such as those from the Ford 8.8 or the GM 10-bolt differentials.

Type of Differential

The type of differential you choose will affect your car’s handling and performance. Limited-slip differentials (LSD) are popular for their ability to provide better traction during acceleration and cornering.

Gear Ratio

The gear ratio affects acceleration and top speed. A lower gear ratio (higher numerical value) will provide quicker acceleration, while a higher ratio will improve highway cruising efficiency.

Choosing the Right Axles

Axles must be strong enough to transfer the power from the differential to the wheels without failure. Consider the following factors when selecting axles for your Miata LS swap:

  • Material: Look for axles made from high-strength materials.
  • Diameter: Thicker axles can handle more torque.
  • Aftermarket Options: Consider aftermarket axles designed for performance applications.
  • Compatibility: Ensure they fit with your chosen differential and suspension setup.

Material

High-strength materials, such as chromoly steel, are recommended for axles in high-power applications. These materials provide better durability and resistance to bending or breaking under load.

Diameter

A larger diameter axle can handle more torque and is less likely to fail under high-stress conditions. It’s essential to choose axles that are appropriately sized for your power output.

  • Ford 8.8: Known for its strength and aftermarket support.
  • GM 10-Bolt: A common choice with a good balance of strength and weight.
  • Miata OEM LSD: A viable option for lower power levels, but may not hold up to 500 hp.

Aftermarket Axle Recommendations

  • Racing Beat: Offers high-performance axles specifically for Miatas.
  • Flyin’ Miata: Provides upgraded axles designed for high power applications.
  • Driveshaft Shop: Known for custom axles that can handle extreme power levels.

Installation Considerations

Installing a new differential and axles requires careful planning and execution. Here are some tips to ensure a successful installation:

  • Professional Help: Consider hiring a professional if you’re inexperienced with drivetrain work.
  • Proper Tools: Ensure you have the right tools for installation and adjustment.
  • Alignment: After installation, perform a proper alignment to prevent uneven tire wear.

Conclusion

Choosing the right differential and axles for your Miata LS swap is crucial for handling 500+ hp effectively. By considering power ratings, types, gear ratios, and selecting high-quality axles, you can ensure your Miata performs at its best. With the right components, your Miata can deliver an exhilarating driving experience while maintaining reliability.