TREMEC TKX 5-Speed Conversion Package | 1968-1972 Chevelle | SB/BB Chevy

TREMEC TKX 5-Speed Conversion Package | 1968-1972 Chevelle | SB/BB Chevy

TREMEC TKX 5-Speed Conversion Package | 1968-1972 Chevelle | SB/BB Chevy

Description

Key Features

  • 600 lb-ft torque capacity with 8,000 RPM engine capability and shifts at 7,500 RPM
  • Multiple gear ratio options: Wide (3.27, 1.98, 1.34, 1.00, 0.72) and Close (2.87, 1.89, 1.28, 1.00, 0.68 or 0.81)
  • Compact end-loading case designed specifically to fit '68-'72 Chevelle tunnels without modifications
  • 26-spline input shaft with 31-spline output shaft for added strength
  • Sintered bronze and carbon hybrid synchronizer rings with multi-cone design for smooth 7,500 RPM shifts
  • Three-piece ribbed aluminum housing for structural stiffness and reduced NVH
  • Bolts directly to GM 3-speed and 4-speed Muncie/Richmond bellhousing pattern
  • Compatible with both small block and big block Chevy V8 engines
  • Fully customizable package with bellhousings, flywheels, clutch systems, hydraulics, and crossmembers

Description

Converting your automatic-equipped '68-'72 Chevelle to a modern 5-speed manual just got dramatically easier. TREMEC engineered the TKX case specifically to fit within the narrow confines of the Chevelle tunnel, eliminating the floor modifications that plagued earlier transmission swaps like the TKO and T56. This fully customizable package delivers everything needed to transform your automatic A-body into a proper row-your-own machine while maintaining that factory 4-speed appearance and shifter position.

The TREMEC TKX represents a ground-up redesign built exclusively for the aftermarket. The innovative end-loading case design provides a slimmer profile for superior tunnel clearance while actually increasing case strength through the three-piece ribbed aluminum construction. All gears and shafts are machined from special-grade ASTM 4615 steel, delivering 600 lb-ft of torque capacity across all versions. The hybrid synchronizer rings combine sintered bronze and carbon materials in a multi-cone configuration, enabling crisp, smooth shifts at engine speeds up to 7,500 RPM.

Each package is configured for your specific small block or big block Chevy combination. Choose from wide-ratio (3.27 first gear) or close-ratio (2.87 first gear) gear sets, with overdrive options of 0.68, 0.72, or 0.81 to match your rear axle ratio and driving style. The TKX uses the same bolt pattern as the GM Muncie bellhousing, ensuring proper fitment with MDL's precision bellhousings. The package includes options for hydraulic clutch operation with master cylinders, hydraulic release bearings, and performance clutch sets sized for the 26-spline input shaft.

MDL's guided package builder walks you through selecting the right bellhousing, flywheel, clutch system, hydraulics, crossmember, and driveline components for your specific application. TREMEC recommends HP-MTF, Dexron-III, GM Synchromesh, Mobil 1 Synthetic ATF, or Pennzoil Synchromesh fluid. The TKX accepts 2.7 quarts. Professional installation support and lifetime technical assistance included with every package.

Package Components Available

  • TREMEC TKX 5-speed transmission (multiple gear ratio options)
  • Aluminum and steel bellhousing options with high-performance variants
  • Bellhousing block plates for proper engine-to-transmission alignment
  • Complete hardware kits (aluminum and steel bolt options)
  • Billet steel and lightweight steel flywheels for various SB/BB applications
  • ARP flywheel and pressure plate bolt sets
  • Hydraulic clutch pedal assemblies
  • Pedal pad kits (dual-bore and master-bore configurations)
  • Hydraulic master cylinder kits (polished, black, and chrome finishes)
  • Performance clutch sets configured for hydraulic operation
  • Hydraulic release bearings
  • Braided stainless hydraulic lines
  • Custom shift knobs with thread adapters (3/8-16 and 3/8-24)
  • Hurst and custom offset shift levers
  • Leather shift boots with mounting rings
  • Speedometer cable adapters and electronic speed sensors
  • Speedometer driven gears (16-21 tooth options)
  • Reverse light wiring harness
  • Custom crossmembers and polyurethane transmission mounts
  • TREMEC HP-MTF transmission fluid
  • 31-spline slip yokes (1310, 1330, and 1350 U-joint series)
  • Complete installation instructions and lifetime technical support
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