Auto to TKX Conversion Package | 1965-1966 Mustang | Modular Engine

Auto to TKX Conversion Package | 1965-1966 Mustang | Modular Engine

Auto to TKX Conversion Package | 1965-1966 Mustang | Modular Engine

Description

Key Features

  • TREMEC TKX rated at 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
  • Complete automatic-to-manual conversion for '65-'66 Mustang with Ford modular engine swap (4.6L/5.0L Coyote/5.4L)
  • Choice of wide-ratio (3.27:1 first gear, 0.72 overdrive) or close-ratio (2.87:1 first gear, 0.68 or 0.81 overdrive) gear sets
  • Single overdrive fifth gear reduces highway RPMs and improves fuel efficiency
  • Three factory shifter locations for custom fitment
  • Floor support modification required - moves mounting point back 2.75 inches from automatic position
  • Fully customizable guided package builder - select each component to match your build
  • MDL concierge service available for personalized part selection

Description

Dropping a Ford modular engine into your '65-'66 Mustang opens up serious horsepower potential - but that C4 or C6 automatic can't keep up with what a modern 4.6L, 5.0L Coyote, or 5.4L puts down. This complete TKX conversion package delivers everything needed to swap from automatic to a modern 5-speed manual built specifically for high-horsepower modular builds. The TREMEC TKX handles 600 lb-ft of torque and shifts cleanly at 7,500 RPM, making it the right choice when your modular swap pushes past 400 horsepower.

The TKX's end-loaded design creates the slimmest 5-speed case on the market, but early Mustang tunnels still require modification. This conversion moves the floor support back 2.75 inches from the automatic transmission mounting point - a necessary trade-off for the TKX's superior strength and shift quality. The three-piece ribbed aluminum housing provides outstanding structural stiffness while multi-cone synchronizers with hybrid carbon-bronze rings deliver smooth, precise shifts throughout the RPM range. A single overdrive fifth gear drops highway cruising RPMs significantly, improving both fuel economy and long-distance drivability.

MDL's guided package builder walks you through every component selection. Start with your TKX gear ratio choice - wide-ratio with a 3.27:1 first gear for maximum low-end pull, or close-ratio with a 2.87:1 first to keep your modular in its powerband. From there, select your modular-specific bellhousing, clutch assembly matched to your power level, billet flywheel, complete hydraulic clutch system, and all mounting hardware. Every piece is engineered to work together, eliminating the compatibility headaches that plague piecemeal conversions.

Not sure which components fit your budget and power goals? MDL's concierge service provides one-on-one consultation to help you spec the perfect package. Whether you're building a street cruiser or a weekend warrior, this conversion delivers the engagement and control that only a proper manual transmission provides.

What's Included

Components selected through guided package builder:

  • TREMEC TKX 5-speed transmission (choice of gear ratios: wide-ratio 3.27/1.98/1.34/1.00/0.72 or close-ratio 2.87/1.89/1.28/1.00/0.68 or 0.81)
  • Ford modular engine bellhousing (aluminum or steel options)
  • Bellhousing block plate
  • Bellhousing hardware kit (aluminum or steel)
  • Complete clutch assembly with 26-spline disc (multiple torque ratings available)
  • ARP pressure plate bolts
  • Billet steel flywheel for modular engines
  • ARP flywheel bolts
  • Hydraulic master cylinder kit (multiple reservoir options)
  • Hydraulic release bearing
  • Braided stainless hydraulic line
  • Clutch pedal assembly for '65-'66 Mustang automatic-to-manual conversion
  • Adjustable clutch pedal stop
  • Pedal pad kit
  • Custom offset shifter
  • Shift lever and knob (multiple styles available)
  • Shift boot
  • Speedometer cable or electronic sensor
  • Speedo gear clip
  • Transmission mount
  • 31-spline slip yoke (1310, 1330, or 1350 U-joint series)
  • TREMEC HP-MTF transmission fluid (3 quarts)
  • MDL lifetime technical support
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Final step

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