Best Transmission Upgrades for an Ls Swap 240sx to Handle 700+ Hp

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The Nissan 240SX has become a popular platform for LS swaps due to its lightweight chassis and excellent handling characteristics. However, achieving 700+ horsepower requires not only a powerful engine but also reliable transmission upgrades. In this article, we explore the best transmission upgrades for an LS-swapped 240SX to ensure it can handle the increased power and torque.

Understanding the Need for Transmission Upgrades

When swapping an LS engine into a Nissan 240SX, the stock transmission often struggles to cope with the increased power. Upgrading the transmission is essential to ensure durability, reliability, and performance. Here are a few reasons why upgrading your transmission is crucial:

  • Power Handling: Stock transmissions may not handle the torque output of a high-powered LS engine.
  • Reliability: Upgraded transmissions are designed to endure the stresses of high horsepower applications.
  • Performance: Better gear ratios and shifting capabilities improve acceleration and overall driving experience.

When it comes to selecting a transmission for your LS-swapped 240SX, there are several options available. Each option has its own set of advantages and considerations. Here are the top choices:

  • T56 Transmission: A popular choice for LS swaps, the T56 is a six-speed manual transmission known for its strength and versatility.
  • TH400 Transmission: This three-speed automatic transmission is robust and can handle high horsepower, making it a favorite for drag racing.
  • 4L80E Transmission: A heavy-duty automatic option, the 4L80E is ideal for high-torque applications and offers electronic control for better performance.

Detailed Overview of Each Transmission

T56 Transmission

The T56 transmission is a well-regarded option for LS swaps, particularly for those seeking a manual experience. It features:

  • Gear Ratios: With a wide range of gear ratios, the T56 provides excellent acceleration and top-end speed.
  • Strength: Capable of handling over 700 hp with the right components.
  • Aftermarket Support: Numerous aftermarket parts are available for performance enhancements.

TH400 Transmission

The TH400 is a legendary automatic transmission known for its durability. Key features include:

  • Heavy-Duty Design: Built to withstand high horsepower and torque, making it ideal for drag racing applications.
  • Simplicity: Fewer components mean easier maintenance and reliability.
  • Performance Upgrades: Can be easily modified for increased performance with aftermarket parts.

4L80E Transmission

The 4L80E offers a blend of strength and modern technology. Its advantages include:

  • Electronic Control: Provides better shift points and performance tuning capabilities.
  • High Torque Capacity: Designed to handle significant power, making it suitable for high-horsepower builds.
  • Versatility: Can be used in various applications, from street to track.

Considerations for Choosing a Transmission

When selecting the right transmission for your LS-swapped 240SX, consider the following factors:

  • Power Goals: Ensure the transmission can handle your desired horsepower and torque levels.
  • Driving Style: Choose between manual and automatic based on your preference and intended use.
  • Budget: Factor in the cost of the transmission itself, along with any necessary adapters and modifications.

Essential Supporting Modifications

Upgrading your transmission is just one part of the equation. To maximize performance and reliability, consider these supporting modifications:

  • Driveshaft Upgrade: A stronger driveshaft is necessary to handle the increased power and torque.
  • Transmission Cooler: Keeping the transmission cool is vital for longevity, especially under high-stress conditions.
  • Shifter Upgrade: A high-quality shifter can improve shifting feel and speed, enhancing the driving experience.

Conclusion

Upgrading the transmission in your LS-swapped 240SX is crucial for handling 700+ horsepower effectively. The T56, TH400, and 4L80E are all excellent choices, each offering unique benefits. By considering your power goals, driving style, and supporting modifications, you can create a reliable and high-performing setup that will elevate your driving experience.