TREMEC TKX 5-Speed Conversion Package | 1966-1967 Chevy II | Small Block Chevy

TREMEC TKX 5-Speed Conversion Package | 1966-1967 Chevy II | Small Block Chevy

TREMEC TKX 5-Speed Conversion Package | 1966-1967 Chevy II | Small Block Chevy

Description

Key Features

  • 600 lb-ft torque capacity with 8,000 RPM engine capability and shift speeds up to 7,500 RPM
  • Compact end-loaded case design fits '66-'67 Chevy II tunnel with minimal modifications
  • Fully customizable package with expert drivetrain consultation included
  • 26-spline input shaft and 31-spline output shaft for maximum strength
  • Sintered carbon/bronze hybrid triple-cone synchronizers with non-leading tooth profile
  • Bolts directly to GM Muncie/Richmond bellhousing pattern
  • Multiple gear ratio configurations available: wide-ratio (3.27 first) or close-ratio (2.87 first)
  • High-performance billet aluminum short-throw shifter with three mounting locations
  • All gears and shafts made from special-grade ASTM 4615 steel

Description

Converting your '66-'67 Chevy II from an automatic to a modern five-speed overdrive manual used to mean major tunnel surgery and fitment headaches. The TREMEC TKX changes that equation. Designed from the ground up as an aftermarket transmission, the TKX features the slimmest case profile of any five-speed on the market, engineered specifically to clear the tight confines of classic GM A-body tunnels. For Chevy II owners, this means overdrive fuel economy and modern shift quality without the fabrication nightmares that plagued earlier conversions.

The TKX delivers serious durability alongside its compact dimensions. With 600 lb-ft of torque capacity and safe shifting at 7,500 RPM, it handles everything from a mild 327 to a built 383 stroker. The three-piece ribbed aluminum housing provides outstanding structural stiffness, while tapered roller bearings on the input, output, and countershafts reduce noise and improve longevity. Sintered carbon/bronze hybrid triple-cone synchronizers eliminate the stiff, notchy feel of older five-speeds, delivering smooth, crisp shifts even under aggressive driving.

MDL's package approach takes the guesswork out of your conversion. Our drivetrain specialists have engineered complete solutions specifically for '66-'67 Chevy II small block applications. The guided selection process walks you through transmission gear ratios, bellhousing options (aluminum or steel), flywheel configurations, clutch sizing, hydraulic release systems, shifter positioning, crossmember fitment, and driveline components. Every package is customized to your specific engine combination, driving style, and budget. At any point, our concierge service can step in to ensure you get exactly the right parts for your build.

Compatible with all small block Chevrolet V8 engines in 1966-1967 Chevy II applications. Some tunnel modifications may be required depending on floor pan condition and exact vehicle configuration. Professional installation recommended. Lifetime technical support included with every package.

Kit Includes

Customizable package components selected based on your specifications:

  • TREMEC TKX five-speed transmission (wide-ratio 3.27/0.72 or close-ratio 2.87/0.68 or 2.87/0.81 configurations)
  • Application-specific bellhousing (aluminum or high-performance steel options)
  • Bellhousing block plate
  • Hardware installation kit (aluminum or steel fasteners)
  • Flywheel (steel, lightweight steel, cast iron, or aluminum options with application-specific balancing)
  • Flywheel bolts (standard or ARP)
  • Clutch kit (multiple hydraulic-compatible options from street to high-performance)
  • Pilot bushing
  • Pressure plate bolts (standard or ARP)
  • Clutch pedal assembly
  • Pedal pad kit
  • Hydraulic master cylinder kit (multiple finish options)
  • Hydraulic release bearing
  • Hydraulic line
  • Shift knob (multiple styles and finishes)
  • Shift knob thread adapter (if required)
  • Shift lever (Hurst or custom options)
  • Shift boot
  • Speedometer cable adapter
  • Speedometer driven gear (matched to your rear axle ratio)
  • Speedometer gear clip
  • Electronic speedometer sensor (optional)
  • Reverse light wiring harness
  • Application-specific crossmember
  • Transmission mount
  • Transmission fluid (HP-MTF or ATF)
  • Slip yoke (31-spline, multiple U-joint sizes available)
  • Professional consultation and lifetime technical support
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