TREMEC TKX 5-Speed Conversion Package | Shelby CSX4000/6000 | SBF Fiberglass

TREMEC TKX 5-Speed Conversion Package | Shelby CSX4000/6000 | SBF Fiberglass

TREMEC TKX 5-Speed Conversion Package | Shelby CSX4000/6000 | SBF Fiberglass

Description

Key Features

  • TREMEC TKX 5-speed rated at 600 lb-ft torque capacity with 8,000 RPM engine speed capability and 7,500 RPM shift points
  • 26-spline input shaft with 31-spline output shaft for maximum drivetrain strength
  • Compact end-loaded case design fits tight Cobra transmission tunnels without floor modifications
  • Three-piece ribbed aluminum housing delivers structural stiffness with reduced weight (99 lbs dry)
  • Single overdrive fifth gear reduces highway RPMs for improved cruising and fuel economy
  • Bolts directly to Ford four-speed bellhousing pattern for straightforward installation
  • Side-shift configuration places shifter through stock location to retain OEM appearance
  • Multi-cone synchronizers with sintered bronze and carbon hybrid rings for smooth high-RPM shifts
  • Guided package selection with concierge support for optimal component matching
  • 2.7 quart fluid capacity

Description

The original Shelby Cobras were never about compromise - and your CSX4000 or CSX6000 continuation shouldn't be either. This TREMEC TKX 5-speed conversion package delivers modern drivetrain capability to small block Ford-powered fiberglass-bodied Cobras, eliminating the limitations of vintage four-speed transmissions while adding a single overdrive gear that transforms high-RPM blasts into genuinely usable highway cruisers.

The TREMEC TKX represents purpose-built aftermarket engineering - not a repurposed OEM unit. Its end-loaded architecture creates a slimmer case profile that clears tight Cobra transmission tunnels without cutting sheet metal. The three-piece ribbed aluminum housing provides outstanding structural stiffness while gaskets at all flanges eliminate fluid leaks. All gears and shafts are machined from special-grade ASTM 4615 steel with wide gear widths that increase both service life and torque capacity. Multi-cone synchronizers with hybrid sintered bronze and carbon rings deliver smooth, positive shifts at engine speeds up to 7,500 RPM - the kind of high-RPM capability that matches the character of a properly built small block Ford.

MDL's guided package selection walks you through every component choice: bellhousing options (aluminum or steel), hydraulic external slave cylinder kits, flywheel configurations (steel, aluminum, or billet with various balance weights), clutch sets from single-disc to dual-disc configurations, and all supporting hardware. Every option has been validated specifically for small block Ford applications in fiberglass-bodied Shelby continuation cars. The side-shift TKX places the shifter through the stock location to maintain authentic cockpit appearance while delivering clean, crisp modern shift quality.

Whether you're building a weekend canyon carver or a serious track weapon, this package provides the foundation for a reliable, high-performance drivetrain that honors the spirit of Carroll Shelby's original vision while delivering the durability and refinement of modern engineering. At any point in the selection process, MDL's concierge service is available to help match components to your specific engine combination and budget.

What's Included

This is a fully customizable package. Select from these expertly curated options during configuration:

  • TREMEC TKX 5-speed transmission (multiple gear ratio configurations available)
  • Ford-pattern bellhousing (aluminum or steel construction options)
  • Bellhousing hardware kit (aluminum or steel fasteners)
  • Hydraulic external slave cylinder kit
  • Flywheel (steel, aluminum, or billet options with 0-balance, 28oz, or 50oz configurations; SFI-approved options available)
  • Complete clutch set (multiple torque capacity options)
  • ARP flywheel bolts
  • Pressure plate bolts (standard or ARP)
  • OEM-style shift lever
  • Shift knob (black or polished finish options; OEM-style available)
  • Shift boot
  • Speedometer cable
  • Speedometer driven gear (16-21 tooth options for proper calibration)
  • Speedometer gear retaining clip
  • Electronic speedometer sensor (optional)
  • Speedometer housing
  • Transmission mount
  • High-performance manual transmission fluid (3 quarts)
  • CSX4000/6000-specific driveshaft
  • Lifetime technical support from MDL
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