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The RX-7 is a beloved sports car known for its lightweight design and rotary engine. However, many enthusiasts opt for an LS swap to enhance power and performance. One of the critical decisions in this process is selecting the right transmission. This article will explore the two popular options: the T56 and the 4L60E, focusing on their power handling capabilities, advantages, and drawbacks.
Understanding the LS Swap
Before diving into transmission options, it’s essential to understand what an LS swap entails. An LS swap involves replacing the stock rotary engine of the RX-7 with a Chevrolet LS series engine. This swap provides significant power gains and reliability, making it a popular choice among car enthusiasts.
Transmission Overview
When it comes to LS swaps, two of the most common transmissions are the T56 and the 4L60E. Each transmission has its unique characteristics that cater to different driving styles and performance goals.
T56 Transmission
The T56 is a six-speed manual transmission that has gained popularity in the LS swapping community. It is known for its strength and ability to handle high power outputs, making it an excellent choice for performance-oriented builds.
- Power Handling: The T56 can handle upwards of 700 horsepower, making it suitable for high-performance applications.
- Shifting Experience: The manual nature of the T56 provides a more engaging driving experience, allowing for precise control over gear changes.
- Aftermarket Support: There is a robust aftermarket for the T56, including performance upgrades and replacement parts.
4L60E Transmission
The 4L60E is a four-speed automatic transmission that is widely used in various GM vehicles. It offers a balance between performance and drivability, making it a popular choice for those who prefer an automatic transmission.
- Power Handling: The 4L60E can handle around 400 to 500 horsepower, which is adequate for many LS swap applications but may require upgrades for higher power builds.
- Ease of Use: The automatic nature of the 4L60E makes it easier to drive, particularly in traffic or for daily use.
- Cost-Effective: Generally, the 4L60E is less expensive than the T56, both in terms of initial cost and installation.
Comparing T56 and 4L60E
When deciding between the T56 and 4L60E for your RX-7 LS swap, consider the following factors:
- Power Goals: If you plan on pushing your LS engine to high horsepower levels, the T56 is the better option.
- Driving Style: For enthusiasts who enjoy manual shifting and a more connected driving experience, the T56 is ideal. Conversely, if you prefer convenience and ease of driving, the 4L60E may be more suitable.
- Budget: The 4L60E is generally more affordable, making it a good choice for those on a tighter budget.
Installation Considerations
Both transmissions will require specific modifications for proper installation in an RX-7. Here are some considerations to keep in mind:
- Transmission Mount: Custom mounts may be necessary for either transmission to fit correctly in the RX-7 chassis.
- Driveshaft: The length and compatibility of the driveshaft will need to be assessed and potentially modified.
- Wiring and Electronics: The 4L60E will require additional wiring for the transmission control module, while the T56 will need a clutch pedal assembly for manual operation.
Conclusion
Ultimately, the choice between the T56 and 4L60E for an RX-7 LS swap depends on your specific goals and preferences. The T56 offers superior power handling and an engaging driving experience, while the 4L60E provides convenience and a lower cost. By considering your driving style, power goals, and budget, you can make an informed decision that will enhance your RX-7’s performance.