Auto to TKX Conversion Package | 1967-1968 Mustang/Cougar | FE Big Block

Auto to TKX Conversion Package | 1967-1968 Mustang/Cougar | FE Big Block

Auto to TKX Conversion Package | 1967-1968 Mustang/Cougar | FE Big Block

Description

Key Features

  • 600 lb-ft torque capacity with 8,000 RPM capability and shifts at 7,500 RPM
  • 26-spline input shaft with 31-spline output shaft for maximum strength
  • Multiple gear ratio configurations available: wide ratio (3.27 first gear) or close ratio (2.87 first gear)
  • End-loaded case design delivers slimmer profile for superior tunnel clearance without floor pan modifications
  • High-performance short-throw billet aluminum shifter isolates road noise while delivering clean, crisp shifts
  • Robust internal three-rail shift system with steel shift forks
  • 2.7-quart fluid capacity
  • All gears and shafts machined from special grade ASTM 4615 steel
  • Guided package builder walks you through every component selection
  • Concierge service available for personalized build consultation

Description

Ditch the slushbox and transform your '67-'68 Mustang or Cougar into a proper driver's car with this comprehensive TREMEC TKX conversion package. Purpose-built for Ford FE big block applications including the legendary 390, 427, and 428, this package delivers everything you need to swap from automatic to a modern five-speed manual. The FE engines that powered Ford's muscle car dominance deserve a transmission that can keep up - and the TKX delivers 600 lb-ft of torque capacity with the refined shift quality and overdrive efficiency that vintage four-speeds simply cannot match.

The TKX represents the next generation in five-speed technology, designed from the ground up specifically for the aftermarket. Its end-loaded case architecture creates the slimmest profile of any five-speed on the market, clearing the transmission tunnel in classic muscle cars without the floor pan hacking that earlier swaps demanded. Multi-cone synchronizers with hybrid sintered bronze and carbon rings eliminate the notchy, mechanical feel of period transmissions, enabling confident shifts at up to 7,500 RPM. The three-piece ribbed aluminum housing provides outstanding structural stiffness while gaskets at all flanges eliminate fluid leaks.

Inside, all gears and shafts are machined from special grade ASTM 4615 steel, and oversized gear widths maximize torque capacity and service life. The internal three-rail shift system with steel shift forks ensures positive engagement, while the high-performance billet aluminum shifter isolates road noise and vibration. The 31-spline output shaft uses Ford C6-style slip yokes, integrating seamlessly with period-correct driveline components while providing modern strength.

Our guided package builder walks you through every component decision - bellhousing options (standard or SFI-approved), hydraulic clutch systems, clutch sets matched to your power level, shifter configurations, crossmembers, and drivetrain components. Every piece is engineered specifically for FE big block applications in '67-'68 Mustangs and Cougars. Unsure about any selection? Our technical team provides concierge-level support to ensure proper component matching for your specific build. Made in the USA.

What's Included

Package components are selected during configuration and may include:

  • TREMEC TKX 5-speed transmission (multiple gear ratio options available)
  • Ford FE bellhousing (standard or SFI-approved)
  • TKX Ford installation hardware kit
  • Clutch pedal assembly for '67-'68 Mustang/Cougar
  • Pedal pad kit (multiple finish options)
  • Clutch pedal stop
  • Clutch pedal bushing/bearing
  • Hydraulic master cylinder kit
  • Hydraulic release bearing assembly
  • Hydraulic line with fittings
  • Clutch set with disc and pressure plate (multiple torque ratings available)
  • Heavy-duty pilot bearing for twin-disc applications
  • Pressure plate bolts (standard or ARP)
  • ARP flywheel bolts
  • Shift knob (multiple styles and finishes)
  • Shift lever (multiple lengths available)
  • Shift boot (multiple materials)
  • Shift boot bezel (multiple finishes)
  • Custom TKX crossmember for '67-'73 Mustang
  • Transmission mount
  • Speedometer cable
  • Speedometer driven gear (multiple tooth counts for ratio matching)
  • Speedometer gear retaining clip
  • Electronic speedometer sensor option
  • TREMEC transmission fluid (3 quarts)
  • Reverse light wiring harness
  • 31-spline driveshaft yoke (multiple U-joint sizes: 1310, 1330, 1350)
  • Lifetime technical support
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