Auto to TKX Conversion Package | 1999-2004 Mustang 4.6L V8

Auto to TKX Conversion Package | 1999-2004 Mustang 4.6L V8

Auto to TKX Conversion Package | 1999-2004 Mustang 4.6L V8

Description

Auto to TKX Conversion Package | 1999-2004 Mustang 4.6L V8

Key Features

  • 600 lb-ft torque capacity with 8,000 RPM capability and 7,500 RPM shift points - built for high-output modular motors
  • 26-spline input shaft with 31-spline output shaft for maximum strength transfer
  • Multi-cone synchronizers with sintered bronze and carbon hybrid rings for smooth, high-RPM shifts
  • Compact end-loaded case design - fits most tunnels without floor modifications
  • Multiple gear ratio options - wide ratio (3.27:1 first) or close ratio (2.87:1 first) with 0.68, 0.72, or 0.81 overdrive
  • Three-piece ribbed aluminum housing provides outstanding structural stiffness at only 99 lbs dry weight
  • 2.7-quart fluid capacity - accepts TREMEC HP-MTF or Dexron-III ATF
  • Complete configurable package - select your transmission, bellhousing, clutch, hydraulics, and accessories

Description

Transform your automatic '99-'04 Mustang into a proper stick-shift machine with this complete TKX conversion package. This is not just a transmission swap - it is a carefully engineered drivetrain upgrade delivering everything needed to bolt a modern 5-speed manual behind your 4.6L modular V8 and put you back in control of every shift.

The TREMEC TKX represents the latest evolution in 5-speed technology, purpose-built for the aftermarket from the ground up. Rated at 600 lb-ft across all configurations, it handles built modulars pushing serious power without flinching. The redesigned end-loaded case clears tight transmission tunnels while ASTM 4615 special-grade steel gears and oversized gear widths deliver extended service life under high torque loads. Enhanced double-lined carbon-fiber synchronizers eliminate the notchy feel of older transmissions, with chamfered shift gates and ball detents on each of the three rails providing clean, crisp engagement even at 7,500 RPM.

Our guided package configurator walks you through every component choice - from transmission gear ratios and bellhousing options to clutch selection and hydraulic release systems. The 31-spline output uses Ford C6-style slip yokes, integrating cleanly with existing driveline components or upgrades. Whether you are building a weekend warrior or a daily-driven street machine, this package scales from bolt-on reliability to track-ready performance.

Every MDL TKX package is application-specific for your Mustang and power level. Made in the USA with lifetime technical support from our Caldwell, Idaho facility - because when you are swapping the heart of your drivetrain, you want it done right the first time.

What's Included

This is a configurable package. Select your specific components during checkout:

  • TREMEC TKX Transmission: Choice of Ford 26-spline models with close ratio (2.87, 1.89, 1.28, 1.00) or wide ratio (3.27, 1.98, 1.34, 1.00) gearing and 0.68 or 0.72 overdrive
  • Bellhousing: Aluminum or steel options with modular motor block plate included
  • Hardware Kits: Transmission-to-bellhousing mounting hardware matched to bellhousing material
  • Clutch Fork: Bellhousing-compatible mechanical release fork
  • Flywheel Options: Steel flywheels for 6-bolt or 8-bolt modular cranks, plus lightweight options for twin-disc applications
  • Flywheel Bolts: ARP-grade fasteners for secure crankshaft mounting
  • Clutch Sets: Single-disc and twin-disc options to match your power level and driving style
  • Pilot Bearing: Standard or heavy-duty options for twin-disc clutch applications
  • Hydraulic Components: Master cylinder kits in multiple configurations, external slave cylinder kit, and stainless braided lines
  • Cable Kit Option: Complete cable clutch release kit available as hydraulic alternative
  • Shift Components: Shift lever, interior boots, and trim pieces
  • Crossmember: Application-specific TKX crossmember for proper driveline angle
  • Speedometer Components: VSS sensor, driven gear selection (16-21 tooth options), and gear retaining clip
  • Transmission Mount: Polyurethane mount for secure installation
  • Transmission Fluid: TREMEC HP-MTF or Dexron ATF (3-quart supply)
  • Wiring: Reverse light harness for proper signal integration
  • Pedal Pads: Replacement brake and clutch pedal pads
  • Driveshaft Yoke: 31-spline slip yoke in 1310, 1330, or 1350 U-joint configurations
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