T56 Super Magnum 6-Speed Gearbox: The Ultimate Upgrade for High-Performance Builds
19th Mar 2026
Upgrade Your Build with the T56 Super Magnum 6-Speed Gearbox
When it comes to high-performance manual transmissions, few options match the reputation and capability of the T56 Super Magnum 6-Speed manual gearbox from Chevrolet Performance. Built for serious power and demanding driving conditions, this transmission has become a go-to choice for enthusiasts, professional builders, and racers who demand both strength and precision.
Built for High-Horsepower Performance
Designed specifically for custom builds and retrofit applications, the T56 Super Magnum is engineered to pair seamlessly with Chevrolet Performance crate engines. It combines the familiar external design of the fourth-generation F-body transmission with upgraded internals derived from the TREMEC TR6060.
These enhancements include:
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Stronger gearsets
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Upgraded input shaft
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Reinforced output shaft
The result is a transmission capable of handling extreme power levels while maintaining long-term durability.
Impressive Torque Capacity and Strength
One of the standout features of the T56 Super Magnum is its ability to handle up to 700 lb-ft of torque, making it ideal for high-performance and forced induction builds.
Key specifications include:
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26-spline input shaft for increased strength
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31-spline output shaft for reliable power delivery
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Heavy-duty internal components designed for high-load conditions
Whether you're pushing big horsepower on the street or the track, this gearbox is built to handle it.
Optimised Gear Ratios for Performance and Comfort
The T56 Super Magnum features a well-balanced set of gear ratios that deliver both aggressive acceleration and smooth cruising:
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1st: 2.66
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2nd: 1.78
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3rd: 1.30
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4th: 1.00
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5th: 0.80
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6th: 0.63
This setup provides:
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Strong launch capability in lower gears
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Efficient highway cruising with double overdrive gears
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Reduced engine RPM at higher speeds
The result is a transmission that performs equally well in street cars, restomods, and long-distance builds.
Designed for Easy Installation and Flexibility
The T56 Super Magnum isn’t just about power—it’s also built with practicality in mind.
Notable features include:
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Slip-yoke design for simplified installation
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40-tooth reluctor ring for compatibility with modern electronic speed sensors
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Multi-position shifter plate for flexible shifter placement
These features make it easier for builders to integrate the transmission into a wide range of custom setups.
Complete Package for a Premium Driving Experience
Beyond performance, the T56 Super Magnum offers a refined, driver-focused experience. The package includes:
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Shifter handle
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Chevrolet Performance logo ball-type shift knob
With an overall length of approximately 33.6 inches (with bellhousing), it’s designed to fit seamlessly into many performance builds while maintaining a factory-quality feel.
Why Choose the T56 Super Magnum?
The T56 Super Magnum stands out as one of the most trusted manual transmissions for high-performance applications because it delivers:
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Proven durability for high-horsepower builds
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Smooth, precise shifting
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Versatility for street, track, and restomod projects
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Industry-leading torque capacity
Final Thoughts
Whether you're building a high-performance street machine, completing a restomod, or preparing a track-ready vehicle, the T56 Super Magnum 6-speed gearbox delivers the strength, reliability, and driver engagement you need.
With its combination of modern engineering and proven performance, it remains one of the best manual transmission upgrades available for serious automotive enthusiasts looking to put power to the ground with confidence.