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The RX-7 has long been a favorite among car enthusiasts, especially when it comes to engine swaps. One of the most popular swaps is the LS engine, known for its high horsepower and reliability. However, pairing the LS engine with the right transmission is crucial for maximizing performance and ensuring a smooth driving experience. In this article, we will explore the best transmission options for a high-horsepower RX-7 LS swap.
Understanding the Requirements
Before diving into specific transmission options, it’s important to understand the requirements of a high-horsepower RX-7 LS swap. The transmission must be able to handle the increased torque and power from the LS engine while also fitting within the RX-7’s chassis.
Key Considerations
- Torque Rating: Ensure the transmission can handle the LS engine’s torque output.
- Weight: Consider the weight of the transmission for overall vehicle balance.
- Fitment: Check compatibility with the RX-7 chassis.
- Gear Ratios: Look for a transmission with suitable gear ratios for performance.
Top Transmission Options
Here are some of the best transmission options for a high-horsepower RX-7 LS swap:
T56 Transmission
The T56 is a popular choice for LS swaps due to its strength and versatility. Originally found in high-performance vehicles like the Chevrolet Corvette and Camaro, the T56 can handle significant horsepower and torque.
- Pros: High torque capacity, multiple gear ratios, widely available.
- Cons: Can be heavy, may require modifications for fitment.
TH400 Transmission
The TH400 is a three-speed automatic transmission known for its durability. It’s a great option for those looking for a simpler setup without the need for a manual transmission.
- Pros: Extremely durable, easy to find, less complex.
- Cons: Limited gear ratios, can lead to higher RPMs at highway speeds.
4L80E Transmission
The 4L80E is a four-speed automatic transmission that offers a good balance between performance and drivability. It has a higher torque rating than the TH400 and provides better fuel efficiency.
- Pros: Better fuel economy, more gear ratios, electronically controlled.
- Cons: More complex installation, requires additional wiring for electronic control.
T5 Transmission
The T5 is a five-speed manual transmission that can be a lightweight alternative for those looking to keep the weight down. While it may not handle as much power as the T56, it’s still a viable option for moderate horsepower builds.
- Pros: Lightweight, good for lower horsepower setups, easier to install.
- Cons: Limited torque capacity, may require upgrades for high-horsepower applications.
Conclusion
Choosing the right transmission for your high-horsepower RX-7 LS swap is essential for achieving the desired performance and reliability. The T56, TH400, 4L80E, and T5 all offer unique advantages and disadvantages, so it’s important to consider your specific needs and goals when making a decision. Ultimately, the right transmission will enhance your driving experience and help you get the most out of your RX-7 build.