TREMEC Magnum XL 6-Speed Transmission Kit – TUKT12021 (Wide Ratio, 0.63 6th Gear)

Built for Street Power, Tuned for Everyday Driveability

Take your 2005+ Mustang to the next level with the TREMEC Magnum XL Wide Ratio Transmission Kit – TUKT12021. Designed for Ford S197 platforms, this complete kit brings brute strength, smooth shifting, and enhanced street drivability together in one unbeatable package.

Whether you're upgrading from a stock 5-speed or a worn TR-3650/TR-6060, this wide-ratio 6-speed kit delivers a versatile balance of torque-heavy launches and relaxed highway cruising. Built on TREMEC’s proven Magnum architecture, the Magnum XL offers increased torque capacity, sharper shifts, and long-term durability.

What’s Included in the TUKT12021 Kit:

• TREMEC Magnum XL Wide-Ratio 6-Speed Transmission
• SFI-Approved Steel Bellhousing
• Crossmember & Transmission Mount
• Isolated Short-Throw Shifter Assembly
• Shift Ball (Black)
• OEM Hydraulic Clutch System Compatible

Wide-Ratio Gear Set for Street-Friendly Performance:

• 1st: 2.97
• 2nd: 2.10
• 3rd: 1.46
• 4th: 1.00
• 5th: 0.80
• 6th: 0.63 (Ideal for highway cruising)
• Reverse: 2.90

Why Choose the Magnum XL Wide Ratio Kit?

The Magnum XL TUET12021 kit isn’t just a transmission swap—it’s a serious upgrade for Mustang owners who want streetable gearing without sacrificing performance. With a 2.97 first gear, launches are strong and confident, while the 0.63 sixth gear offers low RPMs at cruising speeds for better fuel economy and reduced engine wear.

The extended tail housing eliminates the semi-remote shifter found in many late-model Mustangs, delivering tight, direct, high-precision shifts. Every component in this kit is engineered to integrate smoothly with your S197 Mustang, making installation straightforward and performance gains immediate.

Everyday Driveability Meets Race-Ready Strength

Whether you're building a daily-driven street car, a weekend warrior, or a retro restomod, the TREMEC Magnum XL TUKT12021 kit offers the ideal blend of torque, reliability, and refinement.

Perfect For:

• 2005–2014 Ford Mustang GT (S197)
• Street builds focused on torque & cruising comfort
• High-torque V8 applications
• Manual transmission conversions or upgrades