NGP - 2015-2017 Mustang GT Tremec Magnum XL Complete Conversion Kit

2015-2017 Mustang T56 Magnum XL Transmission Swap – Next Gen Performance Center

Upgrade your 2015-2017 Mustang with the T56 Magnum XL 6-speed transmission swap, a robust and reliable solution designed to replace fragile factory transmissions like the Getrag MT-82, TR3650, and shifting-prone TR6060. Known unofficially as the Magnum XL, this transmission delivers race-proven durability and smooth, precise shifting for high-performance Mustangs.

Why Choose the Magnum XL Swap?

• 700 lb-ft torque capacity, built for serious horsepower and torque

• Direct-shift extension housing eliminates the factory’s unpopular semi-remote shifter

• Slip yoke design allows easy swap from weak 2-piece driveshaft to a stronger 1-piece driveshaft

• Two gear ratio options available for different driving styles:

  • Option 1: 1st 2.66, 2nd 1.78, 3rd 1.30, 4th 1.00, 5th 0.80, 6th 0.63

  • Option 2: 1st 2.97, 2nd 2.07, 3rd 1.43, 4th 1.00, 5th 0.80, 6th 0.62

• Compatible with OEM slave cylinder

• Includes speed calibration box required for 2015+ models

• Tunnel clearance required for reverse lockout on 2015+ Mustangs

What’s Included in the Kit?

• T56 Magnum XL transmission with your choice of gear ratio

• Quicktime SFI-rated bellhousing

• Crossmember & transmission mount

• Shifter assembly

• PST aluminum driveshaft with Spicer yoke

• Speedometer conversion and reverse lockout pigtail

• Speed calibration box for 2015+ models

⚙️ Additional Notes:

• 2015+ models will require some tunnel clearance for the reverse lockout mechanism

• Estimated build time: 2-3 weeks

• Expedited shipping is not available due to multiple manufacturer options

• If you have a commercial shipping address, please call for a potential reduction in shipping costs

• Transmission supports various clutch and flywheel options — contact us to find the best fit for your build

Clutch & Flywheel Options:

• Clutches:

  • Spec Stage 2+ (Under 500rwhp, bolt-on cars)

  • Spec Stage 3+ (Power adder builds under 750rwhp)

  • McLeod RST (Stock to power adder under 750rwhp)

  • McLeod RXT (600rwhp-1000rwhp, JPC 2011 GT spec)

  • McLeod RXT 1200 (Up to 1200hp builds)

• Flywheels:

  • Billet Steel (Budget-friendly street option)

  • Lightened Steel (Best for street/strip applications)

  • Aluminum (For maximum performance and weight savings)

Take the next step in Mustang performance with the T56 Magnum XL swap from Next Gen Performance Center — built tough to handle your high-horsepower build with confidence.

Order your swap kit today or contact us to discuss installation and clutch options!