Auto-to-T5z Conversion Package | 1965-1966 Mustang | Small Block Ford 450hp

Auto-to-T5z Conversion Package | 1965-1966 Mustang | Small Block Ford 450hp

Auto-to-T5z Conversion Package | 1965-1966 Mustang | Small Block Ford 450hp

Description

Key Features

  • Complete auto-to-manual conversion for '65-'66 Mustangs with small block Ford engines
  • TREMEC Super Duty T5z transmission rated at 330 ft-lb torque, suitable for 450hp streetcars on DOT-approved tires
  • Gear ratios: 2.95 / 1.94 / 1.34 / 1.00 / 0.63 OD / 2.76 Reverse
  • Deep 0.63:1 overdrive reduces highway RPM for improved fuel economy and quieter cruising
  • Compact and lightweight at just 75 lbs dry - TREMEC's most space-efficient transmission
  • 10-spline input shaft and 28-spline output shaft
  • Offset shifter positions correctly in OEM automatic shifter location - no floor modifications required
  • World Class internals: tapered carrier bearings, needle bearing main gears, carbon fiber synchros on 1-2-3-4
  • Fully customizable package - select bellhousing, clutch, flywheel, hydraulic or cable actuation, and all supporting components

Description

Converting your '65-'66 Mustang from automatic to a proper three-pedal setup shouldn't mean endless research, mismatched parts, and fitment headaches. This comprehensive T5z conversion package delivers everything required to swap in TREMEC's legendary 5-speed behind your small block Ford - configured specifically for first-generation Mustang applications up to 450 horsepower.

The TREMEC Super Duty T5z is the transmission of choice for classic Ford retrofits. At just 75 pounds, it's the smallest and lightest in the TREMEC lineup, yet the Z-spec internals safely handle 330 ft-lb of torque - more than enough for spirited street driving on DOT-approved tires. The 2.95:1 first gear provides strong launch performance without the excessive multiplication that shortens gear life, while the deep 0.63:1 overdrive transforms highway cruising with lower RPM, reduced engine temperatures, and significantly improved fuel economy.

MDL's guided package configurator walks you through every component selection: bellhousing options (aluminum QuickTime or steel factory-style), clutch kits matched to your power level, flywheel material and balance, hydraulic master/slave or cable clutch actuation, crossmember, speedometer components, and all the hardware required for a complete installation. The custom offset shifter drops into the original automatic shifter opening without cutting the floor, maintaining the stock shifter position while delivering crisp, short throws.

Every component in this package has been tested in first-gen Mustang installations to ensure proper fitment and function. The T5z requires 2.75 quarts of ATF Dexron III. If you're uncertain about any selections or have questions about your specific build, MDL's technical team provides concierge service to help configure the correct package for your project and budget.

Kit Includes

This is a fully customizable package system. Components are selected during configuration based on your engine, clutch preference, and installation requirements:

  • TREMEC Super Duty T5z 5-speed transmission (2.95 first / 0.63 overdrive)
  • Custom offset shifter - positions correctly in OEM automatic shifter location
  • Bellhousing selection (aluminum or steel options)
  • Bellhousing block plate
  • Clutch fork
  • Hardware installation kit (bellhousing-specific)
  • Flywheel options (steel, lightweight steel, or aluminum in various balance weights)
  • Flywheel bolts
  • Clutch kit options (pressure plate, disc, throwout bearing)
  • Pressure plate bolts
  • Clutch pedal assembly
  • Pedal pad kit
  • Clutch pedal stop
  • Pedal bushings or bearing
  • Clutch actuation system (hydraulic master/slave kits or cable kit)
  • Shift lever options
  • Shift knob selection
  • Shift boot and bezel options
  • Speedometer cable
  • Speedometer driven gear (matched to your rear axle ratio)
  • Speedo gear clip
  • Transmission crossmember
  • Transmission mount
  • ATF transmission fluid (3 quarts)
  • Reverse light wiring harness
  • Driveshaft yoke (1310, 1330, or 1350 series - 28-spline)
  • MDL lifetime technical support
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