TREMEC TKX 5-Speed Conversion Package | 1971-1973 Mustang/Cougar | FE Big Block

TREMEC TKX 5-Speed Conversion Package | 1971-1973 Mustang/Cougar | FE Big Block

TREMEC TKX 5-Speed Conversion Package | 1971-1973 Mustang/Cougar | FE Big Block

Description

Key Features

  • 600 lb-ft torque capacity handles serious Ford FE big block power
  • Capable of engine speeds to 8,000 RPM with safe shifts at 7,500 RPM
  • Available in wide ratio (3.27:1 first) or close ratio (2.87:1 first) configurations
  • Multiple fifth gear overdrive options (0.68, 0.72, or 0.81) to match your axle ratio
  • Compact end-loaded case design fits transmission tunnels without floor modifications
  • 26-spline input shaft with 31-spline output shaft for added strength
  • Complete auto-to-manual conversion with all clutch, hydraulic, and pedal components
  • Guided package builder with MDL concierge service available

Description

Converting your '71-'73 Mustang or Cougar from automatic to a modern 5-speed manual is one of the most rewarding upgrades you can make to an FE big block-powered car. But sourcing the right transmission, bellhousing, clutch, hydraulics, crossmember, and all the supporting hardware from separate vendors is a time-consuming headache with plenty of room for fitment errors. MDL's TKX conversion package eliminates that guesswork by bundling every component you need into a single, fully customizable kit engineered specifically for your application.

The TREMEC TKX is a purpose-built aftermarket 5-speed designed from the ground up for classic muscle car swaps. With 600 lb-ft of torque capacity and the ability to handle shifts at 7,500 RPM, it matches the demands of built Ford FE engines including the 390, 428, and stroker combinations. The compact end-loaded case design was specifically engineered to fit within narrow transmission tunnels like those in early Mustangs, meaning you get a modern overdrive transmission without cutting your floor. Multi-cone synchronizers with hybrid sintered bronze and carbon rings deliver smooth, precise shifts even under aggressive driving, while a ribbed three-piece aluminum housing provides excellent structural stiffness and reduced NVH.

This package includes your choice of TKX gear ratios, a steel bellhousing for FE applications, billet steel flywheel, complete clutch assembly, hydraulic pedal system, crossmember, and all the driveline components to complete the swap. The guided package builder walks you through selecting the right specifications for your engine combination and driving style. Whether you're building a weekend cruiser or a serious performance machine, MDL's concierge service is available to help you make the right part selections for your project and budget.

Compatible with Ford FE big block engines (390, 427, 428) in 1971-1973 Mustang and Cougar applications. Professional installation recommended.

Kit Includes

  • TREMEC TKX 5-speed transmission (choice of gear ratios)
  • Steel bellhousing for FE big block applications
  • TKX installation hardware kit
  • Billet steel flywheel (application-specific)
  • Complete clutch set with pressure plate and disc (26-spline)
  • Hydraulic throwout bearing
  • Clutch pedal assembly
  • Pedal pad kit
  • Pedal support bracket
  • Clutch cable kit
  • Bellhousing clutch fork
  • ARP flywheel bolts
  • Pressure plate bolts
  • Shift lever and knob (multiple options)
  • Shift boot
  • Speedometer cable and driven gear
  • Speedo gear retaining clip
  • Electronic speedometer sensor (optional)
  • TKX crossmember
  • Transmission mount
  • 3 quarts transmission fluid
  • Reverse light wiring harness
  • 31-spline slip yoke (choice of U-joint series)
  • MDL lifetime technical support
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