TREMEC TKX 5-Speed Conversion Package | 1969-1970 Mustang/Cougar | FE Big Block

TREMEC TKX 5-Speed Conversion Package | 1969-1970 Mustang/Cougar | FE Big Block

TREMEC TKX 5-Speed Conversion Package | 1969-1970 Mustang/Cougar | FE Big Block

Description

Key Features

  • Complete TREMEC TKX 5-speed conversion package for FE big block-powered 1969-70 Mustang and Cougar
  • 600 lb-ft torque capacity handles serious FE power from 390, 427, 428, and stroker combinations
  • 26-spline input shaft with 31-spline output shaft for maximum strength
  • Safe shifting to 7,500 RPM with 8,000 RPM engine speed capability
  • Multiple gear ratio options: wide ratio (3.27:1 first) or close ratio (2.87:1 first)
  • End-loading design delivers slimmer case profile for superior tunnel clearance
  • Retains factory shift lever position for OEM appearance
  • Single overdrive (0.68 or 0.72 fifth gear) reduces highway RPM and improves fuel economy
  • Fully customizable component selection through guided package builder
  • Complete hydraulic clutch conversion included

Description

Converting your automatic-equipped 1969-70 Mustang or Cougar to a modern manual transmission used to mean compromise--adapting small block components to big block power, dealing with floor modifications, or settling for outdated four-speed technology. This comprehensive TREMEC TKX conversion package eliminates those compromises entirely. Engineered specifically for Ford FE big block engines (390, 427, 428, and stroker combinations), every component in this package is selected to work as an integrated system, delivering modern 5-speed performance with the torque capacity your FE demands.

The TREMEC TKX represents the latest evolution in aftermarket 5-speed technology. Its 600 lb-ft torque rating handles the substantial twist FE engines produce, while the compact end-loading case design provides superior tunnel clearance compared to older TKO transmissions. Enhanced gear sizes and revised double-lined carbon-fiber synchronizers enable safe shifts at 7,500 RPM, and special chamfers on the gates combined with dedicated ball detents for each rail eliminate the stiff, notchy feel of previous-generation transmissions. All gears and shafts are manufactured from special-grade ASTM 4615 steel for maximum durability under high-torque loads.

Ford FE engines use a unique 5-bolt bellhousing pattern not shared with small block or 385-series big block Fords, requiring FE-specific bellhousing and clutch components. This package includes the correct FE-pattern bellhousing (with SFI-approved aluminum options available), properly matched clutch assemblies with 26-spline discs, and a complete hydraulic clutch conversion with pedal assembly, master cylinder, and hydraulic release bearing. The hydraulic system delivers consistent, predictable engagement without the maintenance and adjustment hassles of mechanical linkage.

MDL's guided package selection walks you through every component choice--from transmission gear ratios to crossmember configuration to driveshaft yoke selection. Our concierge service is available at any point to help match components to your specific power level, driving style, and budget. Every package includes lifetime technical support to ensure your conversion goes smoothly from unboxing to first burnout.

Kit Includes (Customizable Selection)

  • TREMEC TKX 5-speed transmission with billet aluminum short-throw shifter (wide or close ratio)
  • FE-pattern steel bellhousing (SFI-approved aluminum available)
  • Complete clutch assembly with 26-spline disc (organic, Kevlar, or ceramic options)
  • Hydraulic clutch pedal assembly for 1969-70 Mustang/Cougar
  • Hydraulic master cylinder kit with reservoir
  • Hydraulic release bearing
  • Pre-made hydraulic clutch line
  • Pedal pad kit
  • Clutch pedal bushings
  • TKX-specific crossmember for 1967-73 Mustang/Cougar chassis
  • Transmission mount
  • TKX installation hardware kit
  • Shift lever (Hurst billet or MDL custom options)
  • Shift knob and boot kit
  • Shift bezel
  • Speedometer cable or electronic sensor
  • Speedometer driven gear and clip
  • Reverse light wiring harness
  • 31-spline driveshaft yoke (1310, 1330, or 1350 U-joint series)
  • ARP flywheel bolts and pressure plate bolts
  • Transmission fluid (3 quarts)
  • Lifetime technical support
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