Product Summary

T56, 6-Speed Transmission Speeds, 600 ft./lbs. Torque

  • Extended XL tail housing for optimal shifter placement
  • Direct-mount shifter with crisp, short throws
  • SFI-approved steel bellhousing
  • Mustang-specific crossmember & transmission mount
  • Double overdrive (.80 / .63) for excellent highway manners
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Key Specs

MFG. Part #TUKT12021
BrandTREMEC
Transmission Speeds6-Speed
Input Shaft Spline Count26
Input Shaft Diameter1.125"
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TREMEC TUKT12021 Details

The TREMEC TUKT12021 T56 Magnum XL takes the legendary Magnum platform to the next level. Built with superior strength, lightning-fast precision shifting, and a modern extended-length tail housing, it delivers the perfect shifter position for 2005-up Ford Mustangs.

This Magnum XL completely eliminates the sloppy factory semi-remote shifter setup and replaces it with a rigid direct-mount design for dramatically improved shift feel, shorter throws, and razor-sharp engagement.

Complete “KT” Bolt-In Kit for Ford Modular V8s Engineered specifically for Coyote and Godzilla engines, this is a true drop-in upgrade. The kit includes an SFI-approved steel bellhousing, Mustang-specific crossmember, and OE-quality transmission mount — everything you need for a professional installation with zero fabrication.

Built for Serious Power

  • 700 lb-ft torque capacity
  • Revs safely to 7,800 RPM
  • Double overdrive gearing (.80 / .63) for strong acceleration and relaxed highway cruising

Whether you're building a high-performance street car, weekend warrior, or track-day Mustang, the TUKT12021 Magnum XL delivers the perfect balance of brute strength and refined drivability.

  • Extended XL tail housing for optimal shifter placement
  • Direct-mount shifter with crisp, short throws
  • SFI-approved steel bellhousing
  • Mustang-specific crossmember & transmission mount
  • Double overdrive (.80 / .63) for excellent highway manners

Fitment Notes:

  • Designed for 2005+ Ford Mustangs with Modular V8 engines
  • Direct fit for Coyote and Godzilla platforms
  • Requires 26-spline clutch and one-piece driveshaft

Gear Ratios:

 

2.97 | 2.10 | 1.46 | 1.00 | 0.80 | 0.63 (Rev 2.90)

Warranty Information

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Speedway Motors cannot facilitate the return of defective Tremec products as they have requested to handle these directly with the consumer. For defective product support and Return Authorization, please contact Tremec at +1 (800) 401-9866 (USA) or by ema

TREMEC TUKT12021 Specifications

KEY SPECS
MFG. Part #TUKT12021
BrandTREMEC
Transmission Speeds6-Speed
Input Shaft Spline Count26
Input Shaft Diameter1.125"
GENERAL
Torque600 ft./lbs.
Output Shaft Spline Diameter1.375"
Output Shaft Spline Count31
Case MaterialAluminum
First Gear Ratio2.97:1
Gear Ratio (2nd)2.10:1
Gear Ratio (3rd)1.46:1
Gear Ratio (4th)1.00:1
Gear Ratio (5th)0.80:1
Gear Ratio (6th)0.63:1
Bellhousing IncludedNo
Yoke IncludedNo
Shifter IncludedYes
Gear Ratio (Reverse)2.90:1
Sold in QuantitySet
Yoke StyleSlip On
Shifter StyleLinkage operated

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