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    Auto to TKX Conversion Package | 1971-1973 Mustang Cougar | Small Block Ford
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    Auto to TKX Conversion Package | 1971-1973 Mustang Cougar | Small Block Ford

    Description ▼▲

    Key Features

    • 600 lb-ft torque capacity - handles serious small block Ford power
    • Multiple gear ratio options - wide ratio with 3.27:1 first gear or close ratio with 2.87:1 first gear
    • 26-spline input shaft with 31-spline output shaft for maximum strength
    • Shifts safely at 7,500 rpm with enhanced double-lined carbon-fiber synchronizers
    • Compact, end-loaded case design - fits 1971-1973 Mustang tunnels without modification
    • Customizable component selection - choose only what you need for your build
    • Same mounting and crossmember locations as TKO - true bolt-in installation
    • Lifetime technical support included with complete package purchase

    Description

    Eliminate the sluggish automatic in your 1971-73 Mustang or Cougar and unlock the driving experience these cars were meant to deliver. This complete conversion package transforms automatic-equipped small block Ford V8s into engaging manual transmissions with modern overdrive efficiency. The TREMEC TKX represents the evolution of five-speed technology, built to handle today's power outputs and RPM requirements while delivering the classic driving feel of a proper manual gearbox.

    The TKX's compact, end-loaded design reduces the transmission envelope significantly, solving fitment issues that plagued earlier conversions. The 1971-1973 Mustang and Cougar transmission tunnels accommodate the TKX without cutting or welding. Noise, vibration, and harshness performance is optimized with a gear layout that controls stress levels, while structural stiffness comes from the ribbed, 3-piece aluminum housing. Special gate chamfers and ball detents for each of the three rails eliminate the stiff, notchy shifter feel of older transmissions - instead delivering smooth, precise shifts even at high RPM.

    Our guided package selection walks you through every component choice - from transmission gear ratios and bellhousing options to clutch systems, flywheels, and installation hardware. Whether you're running a mild 289 or a built 351, this system scales to your application with clutch options, flywheel weights, and pedal systems tailored to your specific vehicle. The package includes everything needed for the automatic-to-manual swap: crossmember, pedal assembly, cable clutch system, speedometer components, and all mounting hardware.

    When you purchase a complete MDL conversion package, you get lifetime technical support from enthusiasts who understand your build challenges because we've tackled them ourselves. Compatible with 1971-1973 Ford Mustang and Mercury Cougar equipped with small block Ford V8 engines (289, 302, 351W).

    What's Included

    Choose Your Components:

    • Transmissions: TREMEC TKX 5-speed manual (multiple gear ratio options - 0.68, 0.72, or 0.81 overdrive)
    • Shifters: Custom MDL shifter for OEM shifter position
    • Bellhousings: Aluminum bellhousing options with Ford small block 6-bolt pattern
    • Block Plates: Bellhousing block plate for proper sealing
    • Hardware Kits: Complete fastener sets for Ford small block applications (aluminum or steel options)
    • Clutch Release: Bellhousing clutch fork for cable operation
    • Flywheels: Multiple options including cast steel, billet steel, SFI-approved, and aluminum units in various balance weights
    • Fasteners: ARP flywheel bolts and pressure plate hardware
    • Clutch Systems: Performance clutch sets from premium manufacturers
    • Pedal Assembly: 1971-1973 specific clutch pedal
    • Pedal Hardware: Pedal pad kits and pedal support bracket
    • Clutch Cables: Complete cable clutch conversion kit with heavy-duty lined cable and adjustable bracket
    • Shift Components: Shift knobs, levers, and boots
    • Speedometer: Cables, driven gears, clips, and electronic sensor options
    • Electrical: Reverse light wiring harness
    • Mounting: Application-specific crossmember and transmission mount
    • Fluids: TREMEC-approved transmission oil (3 quarts)
    • Driveline: 31-spline output yokes in multiple U-joint sizes (1310, 1330, 1350)
    • Lifetime technical support
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