TREMEC TKX 5-Speed Conversion Package | 1967-1976 Dodge Dart | Small Block

TREMEC TKX 5-Speed Conversion Package | 1967-1976 Dodge Dart | Small Block

TREMEC TKX 5-Speed Conversion Package | 1967-1976 Dodge Dart | Small Block

Description

Key Features

  • 600 lb-ft torque capacity with 7,500 RPM shift capability across all TKX variants
  • Multiple gear ratio options: 2.87:1 or 3.27:1 first gear with 0.68:1, 0.72:1, or 0.81:1 overdrive
  • 26-spline input shaft with 31-spline output shaft for robust driveline connections
  • Compact end-loaded case design minimizes tunnel modifications in A-body platforms
  • Multi-cone synchronizers with sintered bronze/carbon hybrid rings for superior high-RPM shift quality
  • Three-piece ribbed aluminum housing provides outstanding structural stiffness
  • Fully customizable package: choose transmission, bellhousing, clutch, hydraulics, and driveline components
  • Built-in reverse light switch and cruise control safety switch
  • 99 lbs dry weight with 2.7-quart fluid capacity

Description

Upgrading your '67-'76 Dart from a three-speed slushbox or tired four-speed to a modern overdrive manual used to mean extensive tunnel surgery and fitment headaches. The TREMEC TKX changes that equation. Designed from the ground up as an aftermarket transmission, the TKX's compact end-loaded architecture delivers significantly better tunnel clearance than the previous TKO generation while maintaining the same 600 lb-ft torque capacity your small block Mopar demands.

Where older brass synchronizers would balk at high-RPM shifts, the TKX's multi-cone synchronizers with sintered bronze and carbon hybrid rings deliver crisp, smooth engagement at engine speeds up to 7,500 RPM. The three-piece ribbed aluminum housing -- main case, intermediate plate, and rear extension -- provides the structural stiffness needed for serious power while gaskets at all flanges eliminate the leak-prone RTV joints of earlier designs. All gears and shafts are machined from special-grade ASTM 4615 steel for increased torque-carrying capacity, and oversized gear widths combined with caged needle bearings optimize durability for street and track use.

This fully customizable package builder lets you spec the exact drivetrain for your Dart's mission. Select from close-ratio (2.87:1 first) or wide-ratio (3.27:1 first) gear sets with your choice of overdrive depth. Configure your clutch assembly from single-disc street setups to dual-disc race configurations. Choose hydraulic actuation for modern pedal feel or stick with mechanical linkage. Add the shifter, speedometer drive, transmission mount, and driveshaft yoke that fit your application -- every component is selected specifically for '67-'76 Mopar A-body small block installations.

The TKX accepts TREMEC HP-MTF, Dexron-III, GM Synchromesh, or Mobil 1 Synthetic ATF. The 31-spline output shaft uses Ford C6-style slip yokes, with 1310, 1330, and 1350 U-joint options available. Professional installation recommended for optimal performance and warranty coverage.

What's Included

Components vary based on your custom configuration selections. Package builder includes options for:

  • TREMEC TKX five-speed transmission (multiple gear ratio configurations available)
  • Mopar small block bellhousing
  • Flywheel bolts (standard or ARP)
  • Clutch assembly options (10.5-inch, 26-spline -- single or dual-disc configurations)
  • Clutch disc and pressure plate sets
  • Pressure plate bolts (standard or ARP)
  • Pilot bearing
  • Hydraulic master cylinder kits (multiple bore sizes and reservoir configurations)
  • Braided stainless hydraulic lines
  • Shift lever options (Hurst or MDL custom offset)
  • Shift boot and shift knob (multiple materials and finishes)
  • Speedometer cable, driven gears, and gear clip
  • Electronic speedometer sensor
  • Transmission mount
  • Transmission fluid (HP-MTF or ATF -- 3 quarts)
  • Reverse light wiring harness
  • Transmission tunnel modification components
  • 31-spline slip yoke (1330, 1350, or 1350 forged options)
  • Complete installation hardware
  • Lifetime technical support from MDL
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