TREMEC TKX 5-Speed Conversion Package | 1974-1978 Mustang II | Small Block Ford

TREMEC TKX 5-Speed Conversion Package | 1974-1978 Mustang II | Small Block Ford

TREMEC TKX 5-Speed Conversion Package | 1974-1978 Mustang II | Small Block Ford

Description

Key Features

  • 600 lb-ft torque capacity rated for 8,000 RPM engine speeds and 7,500 RPM shifts
  • 26-spline input shaft and 31-spline output shaft for maximum drivetrain strength
  • Compact end-loaded case design fits Mustang II tunnels without modifications
  • Multi-cone synchronizers with sintered bronze and carbon hybrid rings for smooth high-RPM shifting
  • Three-piece ribbed aluminum housing (main case, intermediate plate, extension) for structural stiffness and reduced NVH
  • Three shifter locations standard for flexible cockpit positioning
  • Multiple gear ratio configurations available: wide ratio (3.27 first) and close ratio (2.87 first)
  • Fully customizable package - transmission, bellhousing, clutch, crossmember, and all supporting components tailored to your build
  • 99 lb dry weight with 2.7 quart fluid capacity

Description

The 1974-1978 Mustang II deserves better than a tired factory four-speed or worn-out automatic. MDL's customizable TREMEC TKX conversion package delivers everything you need to swap in the most advanced aftermarket five-speed ever built - a transmission designed from the ground up specifically for classic car applications, not an OEM gearbox repurposed for the aftermarket.

The TKX addresses every shortcoming of previous five-speeds with engineering that matters. All gears and shafts are manufactured from special-grade ASTM 4615 steel for increased torque capacity, while oversized gear widths handle high-load shifts without complaint. The hybrid synchronizer rings - sintered bronze and carbon construction - combined with multi-cone synchronizer design eliminate the notchy, balky shifting that plagued earlier transmissions, delivering smooth engagement even at 7,500 RPM. A ball detent on each of the three shift rails provides precise, positive gate feel.

Fitment in the Mustang II's compact tunnel is where the TKX truly shines. The end-loaded case architecture creates a slimmer profile than any previous TREMEC five-speed, and the three-piece ribbed aluminum housing provides structural rigidity while minimizing noise, vibration, and harshness. Gaskets at all flanges eliminate fluid leaks that plagued earlier designs. The TKX uses the same mounting points as the TKO, so MDL's custom crossmember drops right in.

MDL's guided package selection walks you through every component choice based on your specific small-block Ford engine, power level, and driving style. Whether you're building a weekend cruiser or a serious performance machine making over 450 horsepower, our concierge service ensures the right transmission ratio, clutch capacity, bellhousing, and supporting components for your project. Every part is selected to work together as an integrated system, eliminating compatibility headaches that plague piecemeal conversions.

What's Included

Your customized package includes your choice of components from these categories, selected to match your engine, power level, and driving requirements:

  • TREMEC TKX 5-speed transmission (wide ratio or close ratio configuration with 0.68, 0.72, or 0.81 overdrive)
  • Billet aluminum custom MDL shifter
  • Application-specific bellhousing for small-block Ford 6-bolt pattern
  • Complete TKX hardware installation kit
  • Performance flywheel (steel or aluminum options in various weights)
  • ARP flywheel bolts
  • Clutch set matched to your power level (multiple disc materials and clamping forces available)
  • Pressure plate bolts (standard or ARP upgrade)
  • Bellhousing clutch fork
  • 1974-1978 Mustang II custom crossmember
  • Shift knob and ball (multiple finishes and styles available)
  • Thread adapters for shift knob compatibility
  • Shift lever (multiple styles and finishes)
  • Speedometer gear for accurate readings
  • Speedometer gear retention clip
  • Electronic speedometer sensor (if applicable)
  • Reverse light wiring harness
  • TREMEC-specified transmission fluid (3 quarts)
  • 31-spline driveshaft slip yoke (multiple U-joint sizes: 1310, 1330, or 1350 series)
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