Description
Tremec T-56 Magnum XL TUKT12021 Overview
The Tremec T-56 Magnum XL Manual Transmission TUKT12021 is part of the Tremec T-56 Magnum XL Manual Transmissions product line and is designed for performance builders who need a strong, modern 6-speed manual transmission with direct-shift precision.
This model is listed under Manufacturer’s Part Number TUKT12021 and Summit Racing Part Number REM-TUKT12021. It is sold individually and includes the shifter, shift knob, crossmember, scatter shield, and 7-tooth internal speedometer drive gear.
The transmission uses a 1.125-inch input shaft diameter, 26-spline input shaft, and 31-spline output shaft. It does not include a bellhousing and does not include a yoke, so buyers should plan those supporting components separately.
The Magnum XL platform begins with an extended-length rear extension housing, designed for late-model performance applications that originally used factory semi-remote shifters. By converting to a more rigid direct-shift arrangement, the Tremec Magnum XL helps eliminate the loose, rubbery shift feel often associated with remote-style factory shifter setups.
With a listed 700 lb-ft torque capacity and rpm capability nearing 8,000 rpm, this Tremec T-56 Magnum XL 6-speed transmission is built for serious performance street, pro-touring, road-racing, and high-output late-model applications when paired with the correct drivetrain components.
Vehicle Fitment and Common Applications
The Tremec T-56 Magnum XL TUKT12021 is intended for late-model performance applications that need an extended-length rear extension housing and direct-shift upgrade over factory semi-remote shifter layouts.
Fitment should be verified by checking the vehicle platform, engine, bellhousing requirements, clutch disc spline count, flywheel, pilot bearing, hydraulic release system, transmission mount, crossmember placement, tunnel clearance, driveshaft length, output yoke, shifter location, speedometer setup, reverse-light wiring, and intended torque level.
Because this transmission does not include a bellhousing and does not include a yoke, buyers should select those components based on the vehicle, engine, clutch, and driveline layout.
This Tremec Magnum XL transmission is commonly selected for high-performance late-model builds, pro-touring projects, road-racing cars, street/strip vehicles, restomod conversions, and custom manual swaps that need a strong 6-speed manual transmission with excellent shift feel.
The included crossmember and scatter shield add practical installation value, but buyers should still verify the complete fitment package before ordering.
6-Speed Double Overdrive Performance
The Tremec T-56 Magnum XL Manual Transmission TUKT12021 gives performance builders a strong 6-speed layout with double overdrive for both acceleration and highway drivability.
| Gear | Ratio |
|---|---|
| First Gear | 2.97:1 |
| Second Gear | 2.10:1 |
| Third Gear | 1.46:1 |
| Fourth Gear | 1.00:1 |
| Fifth Gear | 0.80:1 |
| Sixth Gear | 0.63:1 |
The 2.97 first gear ratio supports strong launch and low-speed acceleration in compatible performance builds. The 1.00 fourth gear provides direct-drive operation, while the 0.80 fifth gear and 0.63 sixth gear deliver double-overdrive cruising ability.
This ratio set is useful for vehicles that need strong performance through the lower gears while still maintaining lower cruising RPM on the highway.
For street performance, road-racing, pro-touring, and high-output late-model applications, the Tremec T-56 Magnum XL offers the strength and gearing flexibility needed for a serious manual drivetrain upgrade.
Magnum XL Direct-Shift Advantage
The Tremec T-56 Magnum XL was developed for late-model performance vehicles that use factory semi-remote shifter arrangements. Those setups can sometimes feel loose, delayed, or rubbery because the shifter is separated from the transmission by remote linkage.
The Magnum XL addresses that problem with an extended-length rear extension housing and a more rigid direct-shift design. This helps deliver a more connected feel between the driver and the transmission.
The result is cleaner engagement, more precise shifts, and a more performance-focused driving experience. For drivers who want a stronger, sharper manual transmission feel, the Magnum XL design is one of the major benefits of this unit.
The supplied description also notes crisp, low-effort shifts, making this transmission well suited for serious performance driving without sacrificing everyday usability when properly installed.
Torque Capacity and High-RPM Capability
The Tremec T-56 Magnum XL TUKT12021 is rated for 700 lb-ft of torque, giving it the strength needed for many high-output performance combinations.
Like the rest of the Magnum line, this transmission is built with durable componentry and race-proven synchronizer technology. The supplied description states that the Magnum XL has rpm capability nearing 8,000 rpm straight out of the box.
This makes it suitable for demanding performance applications where shift accuracy, torque capacity, and high-rpm operation matter.
The aluminum case helps keep the transmission strong while reducing unnecessary weight. The Magnum XL platform is designed for enthusiasts who want modern performance transmission technology with serious strength and refined shift feel.
Input, Output, and Driveline Details
The Tremec T-56 Magnum XL TUKT12021 uses a 1.125-inch input shaft diameter with 26 splines. Buyers should select a compatible 26-spline clutch disc and verify clutch system compatibility before installation.
The output shaft uses 31 splines, so the correct matching yoke must be selected separately. The yoke is not included with this transmission.
The transmission also does not include a bellhousing, so buyers must choose the correct bellhousing for the engine, clutch system, input shaft depth, starter location, and chassis application.
The included 7-tooth internal speedometer drive gear supports speedometer planning, but buyers should verify whether additional speedometer components, sensors, cables, wiring, or calibration parts are needed for the vehicle.
Included and Not Included Components
The Tremec T-56 Magnum XL Manual Transmission TUKT12021 is sold individually and includes several important components.
| Component | Included |
| Transmission Assembly | Yes |
| Shifter | Yes |
| Shift Knob | Yes |
| Crossmember | Yes |
| Scatter Shield | Yes |
| 7-Tooth Internal Speedometer Drive Gear | Yes |
| Bellhousing | No |
| Yoke | No |
Because the bellhousing and yoke are not included, buyers should plan the full installation package before ordering.
Additional parts may include a compatible bellhousing, clutch kit, 26-spline clutch disc, flywheel, pilot bearing, hydraulic release bearing or clutch linkage, transmission mount, driveshaft, 31-spline yoke, speedometer components, reverse-light wiring, fluid, and installation hardware.
This transmission is listed as remanufactured: no, meaning it is not a rebuilt used transmission.
Key Benefits for Performance Builders
The Tremec T-56 Magnum XL TUKT12021 gives performance builders a strong 6-speed manual transmission with modern shift quality and serious torque capacity.
The first major benefit is strength. With 700 lb-ft torque capacity, this transmission is suitable for powerful late-model street, strip, pro-touring, and road-racing builds when paired with the correct drivetrain components.
The second benefit is shift feel. The direct-shift Magnum XL design helps replace vague semi-remote factory shifter feel with crisp, low-effort, precise gear engagement.
The third benefit is double overdrive. The 0.80 fifth gear and 0.63 sixth gear help support lower cruising RPM and improved long-distance drivability.
The fourth benefit is installation value. The included shifter, shift knob, crossmember, scatter shield, and 7-tooth internal speedometer drive gear give buyers more supplied components than many bare transmission assemblies.
Who This Transmission Is Best For
The Tremec T-56 Magnum XL Manual Transmission TUKT12021 is best for performance builders working on compatible late-model applications that need a strong 6-speed manual transmission with an extended-length rear extension housing and direct-shift design.
It is suitable for pro-touring builds, road-racing vehicles, street/strip cars, high-performance late-model upgrades, restomod conversions, and custom manual swaps where the Magnum XL layout fits correctly.
This product is a strong choice for buyers who need 700 lb-ft torque capacity, 26-spline input, 31-spline output, 2.97 first gear, 0.63 sixth gear, double overdrive, included shifter, and improved shift precision.
It is not intended for buyers who need a complete conversion package with bellhousing, yoke, clutch, flywheel, driveshaft, fluid, wiring, or all installation hardware included. Those components must be selected separately based on the vehicle and drivetrain setup.
Technical Details and Included Specifications
The Tremec T-56 Magnum XL Manual Transmission TUKT12021 is a 6-speed manual transmission with double overdrive, aluminum case construction, and high-performance torque capacity.
| Specification | Details |
| Product Type | Manual transmission |
| Brand | Tremec |
| Product Line | Tremec T-56 Magnum XL Manual Transmissions |
| Manufacturer Part Number | TUKT12021 |
| Summit Racing Part Number | REM-TUKT12021 |
| Number of Gears | 6 |
| Torque Capacity | 700 lb-ft |
| Input Shaft Diameter | 1.125 in. |
| Input Spline Quantity | 26 |
| Output Shaft Spline Quantity | 31 |
| Bellhousing Included | No |
| Yoke Included | No |
| Shifter Included | Yes |
| Shift Knob Included | Yes |
| Crossmember Included | Yes |
| Scatter Shield Included | Yes |
| Internal Speedometer Drive Gear | 7-tooth included |
| First Gear Ratio | 2.97:1 |
| Second Gear Ratio | 2.10:1 |
| Third Gear Ratio | 1.46:1 |
| Fourth Gear Ratio | 1.00:1 |
| Fifth Gear Ratio | 0.80:1 |
| Sixth Gear Ratio | 0.63:1 |
| Case Material | Aluminum |
| Rear Extension Housing | Extended length |
| Shift Design | Direct-shift Magnum XL layout |
| RPM Capability | Nearing 8,000 rpm |
| Remanufactured | No |
| Quantity | Sold individually |
| Intended Use | Late-model performance, street, strip, pro-touring, road racing, and custom manual swaps |
Fitment Support and Ordering Notes
Before ordering the Tremec T-56 Magnum XL TUKT12021, buyers should confirm vehicle fitment and supporting components. Important details include vehicle platform, engine, bellhousing requirements, clutch disc spline count, flywheel, pilot bearing, clutch release system, output shaft spline count, yoke selection, driveshaft length, transmission mount, crossmember fitment, tunnel clearance, shifter location, speedometer setup, reverse-light wiring, fluid requirements, and intended torque level.
This transmission includes the shifter, shift knob, crossmember, scatter shield, and 7-tooth internal speedometer drive gear, but it does not include the bellhousing or yoke.
Customers can also compare this product with other Tremec T-56 Magnum XL transmissions, Tremec 6-speed manual transmissions, compatible bellhousings, clutch kits, flywheels, yokes, driveshaft components, transmission mounts, speedometer parts, and installation hardware when planning a complete drivetrain build.
Frequently Asked Questions
What is the Tremec T-56 Magnum XL TUKT12021 designed for?
The Tremec T-56 Magnum XL TUKT12021 is designed for compatible late-model performance applications that need a strong 6-speed manual transmission with an extended-length rear extension housing and direct-shift feel.
What torque capacity does this transmission have?
This transmission is rated for 700 lb-ft of torque, making it suitable for many high-performance street, strip, pro-touring, and road-racing builds when properly matched with supporting components.
Does this transmission include a shifter?
Yes. The shifter is included, and the supplied notes also state that the transmission includes a shift knob.
Does this transmission include a bellhousing or yoke?
No. The bellhousing is not included, and the yoke is not included. Buyers must select compatible parts based on the engine, clutch, and drivetrain setup.
What are the gear ratios?
The gear ratios are 2.97 first, 2.10 second, 1.46 third, 1.00 fourth, 0.80 fifth, and 0.63 sixth. The fifth and sixth gears provide double-overdrive performance.
What additional parts are included?
The supplied notes state that this transmission includes a shift knob, crossmember, scatter shield, and 7-tooth internal speedometer drive gear.
Is this transmission remanufactured?
No. The supplied specification states Remanufactured: No. This is a Tremec T-56 Magnum XL manual transmission sold individually.
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