TREMEC Magnum XL 6-Speed Transmission Kit – TUKT16901 (Close Ratio, 0.63 6th Gear)

Precision Shifting. Street Versatility. Built Ford Fast.

Unleash the true performance of your 2005+ Mustang with the TREMEC Magnum XL Close Ratio 6-Speed Kit – TUKT16901. Engineered for S197 Mustangs, this kit brings together the legendary durability and smoothness of the TREMEC Magnum with gearing optimized for aggressive driving and daily usability.

With a close-ratio gear set and a 0.63 6th gear, the TUKT16901 offers high-RPM acceleration through the gears while keeping cruising RPMs low for highway comfort. Whether you're carving corners, hitting the strip, or just want a more connected street driving experience, this is the manual transmission upgrade your Mustang needs.

Included in the TUKT16901 Kit:

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

Close-Ratio Gear Set for Performance-Driven Builds:

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

What Makes the Magnum XL Kit Different?

The TUKT16901 kit eliminates the semi-remote shifter setup common in late-model Mustangs with an extended tail housing that delivers tight, confident shifts. It’s built for high horsepower and torque, giving you track-ready strength with street-friendly gearing.

This close-ratio version keeps your Mustang in its powerband longer—perfect for spirited driving and road course enthusiasts—while still offering a usable overdrive for highway driving. It’s the ultimate upgrade for drivers who demand total control and reliable performance.

Engineered for Performance. Designed to Fit.

From track days to daily drives, the TREMEC Magnum XL TUKT16901 kit is your go-to solution for upgrading your S197 Mustang’s manual transmission with a modern, durable, and thrilling-to-drive 6-speed gearbox.

Ideal For:

• 2005–2014 Ford Mustang GT (S197)
• Street/track builds focused on response & RPM control
• High-performance manual transmission swaps
• Mustang owners upgrading from TR-3650 or TR-6060