Tremec TUET18131 Magnum XL T56 6-Speed Transmission GM

The TREMEC TUET18131 Magnum XL T56 6-Speed Transmission is a premium high-performance manual transmission designed specifically for late-model GM rear-wheel-drive applications. Based on the legendary TR-6060 platform, the Magnum XL combines race-proven strength with smooth street manners, making it an ideal upgrade for high-horsepower muscle cars, pro-touring builds, and performance street vehicles.

Featuring an extended-length (XL) tail housing, the TUET18131 positions the shifter in the factory location for many late-model GM vehicles, eliminating the need for complicated shifter relocation kits. The rigid direct-mount shifter design delivers precise gear engagement while maintaining excellent noise and vibration control for comfortable street driving.

Rated to handle up to 700 lb-ft of torque, the Magnum XL is built with high-strength gears, upgraded synchronizers, and a reinforced one-piece countershaft capable of supporting naturally aspirated, supercharged, turbocharged, and stroker engine combinations. Its lightweight aluminum construction and dual overdrive gears provide exceptional performance while reducing cruising RPM for improved fuel economy and reduced engine wear.

Whether you’re upgrading a Camaro, CTS-V, GTO, or custom LS-powered project, the Magnum XL delivers the strength, durability, and precision expected from one of the world’s most respected performance transmissions.

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Features

• Genuine TREMEC Magnum XL T56 6-Speed Manual Transmission
• Manufacturer Part Number: TUET18131
• Designed specifically for late-model GM applications
• High-performance close-ratio gear set
• Rated for up to 700 lb-ft of torque
• Extended-length Magnum XL tail housing
• Direct-mount isolated shifter for precise shifting
• High-strength aluminum case
• Fully synchronized forward gears
• Double overdrive design for improved highway cruising
• Electronic speedometer output
• Hydraulic clutch release system
• High-RPM capability up to 7,800 RPM
• Excellent for street performance, pro-touring, road racing, drag racing, and restomod builds

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Gear Ratios

• 1st Gear: 2.66:1
• 2nd Gear: 1.78:1
• 3rd Gear: 1.30:1
• 4th Gear: 1.00:1
• 5th Gear: 0.80:1
• 6th Gear: 0.63:1
• Reverse: 2.90:1

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Specifications

• Brand: TREMEC
• Manufacturer Part Number: TUET18131
• Transmission Type: 6-Speed Manual
• Application: GM Rear-Wheel Drive
• Torque Capacity: 700 lb-ft
• Maximum Engine Speed: 7,800 RPM
• Case Material: Aluminum
• Approximate Dry Weight: 150 lbs
• Input Shaft Diameter: 1.125 inches
• Input Shaft Spline Count: 26
• Output Shaft Diameter: 1.375 inches
• Output Shaft Spline Count: 31
• Release Type: Hydraulic
• Speedometer Output: Electronic
• Fluid Capacity: Approximately 3.7 Quarts
• Shifter Style: Direct-Mount Linkage
• Bellhousing Included: No
• Shifter Included: No
• Slip Yoke Included: No

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Recommended Applications

Compatible with a wide variety of GM rear-wheel-drive performance vehicles when used with the appropriate installation components, including:

• Chevrolet Camaro
• Pontiac GTO
• Cadillac CTS-V
• Chevrolet Corvette (custom applications)
• Chevrolet Chevelle
• Chevrolet Nova
• LS Engine Swap Projects
• Restomod Builds
• Pro-Touring Cars
• Street Performance Vehicles

Vehicle compatibility depends on the correct bellhousing, clutch system, crossmember, driveshaft, transmission mount, and engine combination.

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Installation Requirements

Depending on your vehicle, installation may require:

• GM-compatible bellhousing
• Hydraulic clutch system
• Flywheel
• Clutch kit
• Pilot bearing
• Transmission mount
• Crossmember
• Custom driveshaft with 31-spline slip yoke
• Wiring for reverse lights and speed sensor
• Transmission fluid
• Installation hardware

Professional installation is recommended to ensure proper fitment and maximum performance.

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Package Includes

• TREMEC TUET18131 Magnum XL T56 6-Speed Manual Transmission
• Manufacturer Documentation

Bellhousing, clutch, flywheel, hydraulic release bearing, shifter handle, transmission mount, slip yoke, and installation hardware are sold separately unless otherwise specified.

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Warranty

The TREMEC TUET18131 Magnum XL T56 6-Speed Transmission is backed by a 1-Year Limited Warranty, covering defects in materials and workmanship under normal use and proper installation.