TREMEC TKX 5-Speed Conversion Package | 1967-1968 Mustang/Cougar | Small Block Ford

TREMEC TKX 5-Speed Conversion Package | 1967-1968 Mustang/Cougar | Small Block Ford

TREMEC TKX 5-Speed Conversion Package | 1967-1968 Mustang/Cougar | Small Block Ford

Description

TREMEC TKX 5-Speed Conversion Package | 1967-1968 Mustang/Cougar | Small Block Ford

Key Features

  • 600 lb-ft torque capacity handles serious small block Ford power
  • 8,000 RPM capability with 7,500 RPM shift points - built for high-revving performance applications
  • Single overdrive 5-speed eliminates highway drone while improving fuel economy
  • 26-spline input shaft and 31-spline output shaft for maximum drivetrain strength
  • Compact end-loaded case design reduces floor pan modifications in '67-'68 tunnels
  • Direct bolt-in replacement for TKO transmissions - mounting points and crossmember locations unchanged
  • Multi-cone synchronizers with hybrid carbon/bronze rings deliver smooth high-RPM shifts
  • Multiple gear ratio configurations available (wide-ratio and close-ratio options)
  • Retains OEM shifter location for authentic factory appearance and feel
  • Fully customizable package - select transmission, clutch, flywheel, and supporting components for your build

Description

The manual-to-TKX conversion eliminates the limitations of factory 4-speed manuals while delivering the crisp shifts and overdrive benefits that transform your '67-'68 Mustang or Cougar into a modern performance machine. TREMEC engineered the TKX with a significantly cleaner, shorter leading case section that reduces floor pan modifications, making installation straightforward in the tight confines of early Mustang tunnel designs.

This isn't just a transmission swap - it's a complete drivetrain upgrade. The TKX's three-piece ribbed aluminum housing provides outstanding structural stiffness while keeping weight at just 99 lbs dry. All gears and shafts are manufactured from special-grade ASTM 4615 steel for increased torque-carrying capacity. Enhanced gear sizes and revised double-lined carbon-fiber synchronizer packages deliver smooth shifts at high RPM, while tapered roller bearings on the input, output, and countershafts reduce noise and improve durability.

What sets this package apart is the complete customization. Choose from wide-ratio or close-ratio gear sets, multiple flywheel options, clutch combinations from mild street to track-ready, and shifter configurations that match your driving style. Every component is selected to work together as a system - from the transmission adapter that mates to your existing bellhousing to the crossmember that positions everything perfectly. The robust internal three-rail shift system with steel shift forks ensures crisp, positive gate engagement every time.

Compatible with 1967-1968 Mustang and Cougar small block Ford applications. The 31-spline output shaft uses a Ford C6-style slip yoke, and 2.7-quart fluid capacity keeps the transmission running cool. This package maintains the original shift lever position for authentic feel while delivering modern transmission performance and reliability.

Package Includes (Customizable Selection)

  • TREMEC TKX 5-speed transmission with high-performance short-throw billet aluminum shifter (multiple gear ratio options available)
  • Transmission adapter for OEM bellhousing compatibility
  • Custom shifter assembly with multiple position options
  • Flywheel options (steel or lightweight aluminum, various balance configurations)
  • Clutch kit selection (street to track performance levels)
  • ARP or standard flywheel bolt kit
  • Pressure plate bolt kit (standard or ARP)
  • Shift knob options (multiple styles and finishes)
  • Shift lever options (multiple lengths)
  • Shift boot and bezel combinations
  • Speedometer cable, driven gears, and electronic sensor options
  • Speedometer gear retaining clip
  • Reverse light wiring harness
  • TKX-specific crossmember for 1967-1968 Mustang/Cougar
  • Transmission mount
  • 31-spline driveshaft yoke options (1310, 1330, or 1350 U-joint configurations)
  • Transmission fluid (3-quart capacity)
  • Lifetime technical support
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