2019-2023 Mustang GT TREMEC Magnum XL 6 Speed Manual Transmission Kit

Why Upgrade Your Mustang GT to a Magnum XL?

The factory MT-82 can become a limiting factor as horsepower and torque increase. The TREMEC Magnum XL provides a purpose-built alternative for enthusiasts who want a stronger transmission and more precise shifting characteristics.

The close-ratio gearset helps maintain engine speed between shifts, making the car feel more responsive during spirited driving and acceleration. The 0.63 sixth gear also provides a useful highway overdrive for a performance Mustang that still sees regular street miles.

The Magnum XL is rated for up to 700 lb-ft of torque and supports high-RPM shifting capability up to approximately 7,800 RPM, making it well suited to powerful naturally aspirated and modified Coyote applications.

TUKT19778 Key Features

• TREMEC Magnum XL 6-speed manual transmission
• Designed for 2019+ Ford Mustang GT applications
• Close-ratio 2.66 first gear
• 0.63 sixth-gear overdrive
• 2.66 / 1.78 / 1.30 / 1.00 / 0.80 / 0.63 gear ratios
• 700 lb-ft torque rating
• High-RPM shifting capability up to approximately 7,800 RPM
• 26-spline input shaft
• 31-spline output shaft
• Integrated gear-position sensor
• Direct-mount shifter
• Extended tailhousing for Mustang-oriented shifter positioning
• TREMEC aluminum bellhousing included
• Electronic speedometer output
• Designed as an MT-82 replacement solution
• Suitable for street, performance, and track-oriented builds

Built Around the 5.0L Coyote

The S550 Mustang GT's Coyote V8 is capable of making serious power, and the transmission needs to keep pace. The TUKT19778 Magnum XL combines a performance-focused close-ratio gearset with the strength required for high-output applications.

The 2.66 first gear provides strong initial acceleration without an excessively short launch ratio. From there, the 1.78 second, 1.30 third, and 1.00 fourth gears create tight spacing that helps keep the engine operating in its effective power range.

Fifth gear's 0.80 ratio bridges performance driving and highway use, while the 0.63 sixth gear provides a substantial overdrive for relaxed cruising.

Modern Mustang Electronics Integration

One of the biggest advantages of the TUKT19778 over a traditional aftermarket transmission swap is its integration with modern Mustang electronics.

The Magnum XL incorporates a gear-position sensor, allowing compatible vehicle functions such as factory rev-matching and backup-camera functionality to be retained when the installation is properly configured.

An ECU calibration update is required for gear-position data, with HP Tuners VCM Suite recommended for configuration.

This makes the Magnum XL more than simply a stronger gearbox—it provides a path toward a properly integrated manual-transmission upgrade for the modern S550 Mustang.

Direct-Mount Shifter for Better Shift Feel

The Magnum XL uses a direct-mount shifter rather than relying on the type of semi-remote arrangement found on the factory MT-82.

That design contributes to a more direct connection between the driver's hand and the transmission, delivering a more positive and precise shifting experience. The extended tailhousing places the shifter toward the factory console location, helping the conversion maintain an OEM-oriented cockpit layout.

For Mustang enthusiasts who care about shift quality as much as outright strength, this is a major advantage.

Installation Requirements

A Magnum XL conversion is a substantial drivetrain upgrade and should be planned as a complete system rather than treated as a simple transmission replacement.

The TUKT19778 installation requires:

• 26-spline clutch upgrade
• One-piece driveshaft conversion
• ECU calibration update for the gear-position sensor
• HP Tuners VCM Suite is recommended for configuration

Make sure the clutch, driveshaft, electronics, and supporting drivetrain components are compatible with your specific Mustang before beginning installation.

Freight Shipping

This transmission kit ships by freight/pallet due to its size and weight. Freight charges may require a separate shipping estimate before the order is finalized.