Auto-to-T5 Conversion Package | 1966 Mustang | 200ci Inline Six 136-Tooth

Auto-to-T5 Conversion Package | 1966 Mustang | 200ci Inline Six 136-Tooth

Auto-to-T5 Conversion Package | 1966 Mustang | 200ci Inline Six 136-Tooth

Description

Key Features

  • Complete automatic-to-manual conversion for 1966 Mustang with 200ci inline six
  • TREMEC Super Duty T5 with 2.95:1 first gear and 0.63:1 overdrive - handles 330 ft-lb of torque
  • 136-tooth flywheel sized for automatic-equipped inline six engines
  • Offset shifter positions gear lever in factory location without floor modifications
  • Custom crossmember engineered specifically for '66 Mustang T5 swap
  • Clutch pedal assembly converts automatic pedal box to manual operation
  • Lightweight 75 lb dry weight - installs without structural modifications
  • Customizable component selection for budget and performance requirements

Description

The slushbox C4 served its purpose, but your '66 Mustang deserves the engagement of a proper manual gearbox. This complete conversion package eliminates the guesswork of sourcing compatible components for swapping your automatic-equipped 200ci inline six to a TREMEC T5 five-speed. Every piece has been selected to work together - from the 136-tooth flywheel that matches your engine's existing ring gear count to the custom crossmember that positions the T5 correctly in your Mustang's transmission tunnel.

The heart of this package is the TREMEC Super Duty T5 - the "Z spec" variant built for performance. Where factory Mustang T5s used a 3.35:1 first gear with 0.68:1 overdrive, this transmission features a 2.95:1 first and deeper 0.63:1 overdrive. The result is a transmission rated at 330 ft-lb of torque - far more than your inline six will ever produce - with an overdrive ratio that drops highway RPMs significantly. At just 75 pounds dry, the T5 won't upset your Mustang's already nose-light weight balance.

The offset shifter is engineered to position the gear lever directly in the factory shifter hole, preserving your interior's stock appearance without cutting new holes or modifying the tunnel. The complete clutch pedal assembly replaces your automatic pedal box, and pedal pad kits are available for either manual or disc brake configurations. Choose from organic or Kevlar clutch sets based on your driving style, and select the driven speedometer gear that matches your rear axle ratio for accurate speedometer readings.

MDL's guided package selection walks you through every component choice, or contact the technical team for personalized recommendations. Every part is selected specifically for the 1966 Mustang with 200ci engine - this isn't a universal kit requiring adaptation, it's an engineered solution for your exact application.

Package Includes

  • TREMEC Super Duty T5 transmission - 2.95/1.94/1.34/1.00/0.63 gear ratios, 10-spline input, 28-spline output
  • Optional 5th gear ratio upgrade (0.73:1 or 0.83:1 available)
  • Custom offset shifter for factory lever position
  • Clutch pedal assembly with pedal stop
  • Pedal pad kit (manual brake or disc brake options)
  • Bellhousing block plate
  • Clutch fork boot and clutch fork
  • Clutch fork spring
  • Transmission adapter
  • 136-tooth flywheel with ARP flywheel bolts
  • Clutch set (organic or Kevlar options)
  • Pressure plate bolts (standard or ARP)
  • Custom T5 crossmember
  • Transmission mount
  • Speedometer cable
  • Driven speedometer gear (16-21 tooth options for axle ratio matching)
  • Speedometer gear retaining clip
  • Shift knob and lever options
  • Shift boot and bezel selections
  • Three quarts ATF Dexron III transmission fluid
  • Driveshaft yoke (28-spline, 1310 or 1330 series)
Subtotal 0.00 0 selected
Final step

Review your build

Make sure everything looks right. Click Edit on any row to change a choice.

Package total 0.00