TKX 5-Speed Conversion Package | 1967 GTO, Oldsmobile, Buick A-Body | BOP Engine

TKX 5-Speed Conversion Package | 1967 GTO, Oldsmobile, Buick A-Body | BOP Engine

TKX 5-Speed Conversion Package | 1967 GTO, Oldsmobile, Buick A-Body | BOP Engine

Description

TKX 5-Speed Conversion Package | 1967 GTO, Oldsmobile, Buick A-Body | BOP Engine

Key Features

  • 600 lb-ft torque capacity with 8,000 RPM capability and 7,500 RPM shift points
  • Compact end-loading case design eliminates tunnel modifications on '67 A-bodies
  • Bolts directly to OEM BOP 4-speed bellhousings - no adapter plates required
  • 26-spline input shaft with 31-spline output shaft for maximum drivetrain strength
  • Three gear ratio options: Wide (3.27, 1.98, 1.34, 1.00, 0.72), Close (2.87, 1.89, 1.28, 1.00, 0.68), or Close with 0.81 overdrive
  • Multi-cone synchronizers with hybrid sintered bronze/carbon rings for smooth high-RPM shifts
  • 3-piece ribbed aluminum housing provides structural stiffness at just 99 lbs dry weight
  • Retains original 4-speed shifter position for stock interior appearance
  • Complete customizable package includes transmission, clutch, hydraulics, and driveline components

Description

Transform your 1967 GTO, Oldsmobile 442, Cutlass, or Buick Skylark from automatic to a modern 5-speed manual with this comprehensive TREMEC TKX conversion package. Whether you're tired of the highway RPM penalty from the original Turbo-Hydramatic or want the engagement of rowing your own gears, the TKX delivers modern shift quality and overdrive cruising without sacrificing the character of your BOP-powered A-body. With 600 lb-ft of torque capacity and the ability to handle 8,000 RPM engine speeds, the TKX is built for serious power while still fitting your stock tunnel.

TREMEC engineered the TKX from the ground up as a purpose-built aftermarket transmission - not a repurposed OEM unit. The compact end-loading main case design provides superior tunnel clearance compared to side-loaded transmissions, allowing installation in your '67 A-body without cutting or welding. All gears and shafts are machined from special-grade ASTM 4615 steel for maximum torque capacity, while hybrid synchronizer rings made of sintered bronze and carbon deliver crisp, consistent shifts at high RPM. The three-piece ribbed aluminum housing keeps weight down to just 99 lbs dry while providing the structural stiffness needed for hard launches.

The TKX bolts directly to your stock BOP 4-speed bellhousing, making this swap straightforward for cars that came with a Muncie from the factory. Converting from automatic? MDL's customizable package includes bellhousing options specifically for BOP engines. The factory 4-speed shifter position is retained, so your console and interior maintain their original appearance while you gain a fifth-gear overdrive that drops cruise RPM and extends engine life. A 26-spline clutch disc is required to match the TKX input shaft.

MDL has carefully curated every component in this package to work together seamlessly for your specific application. Our guided package selection walks you through each choice - from gear ratios and clutch kits to hydraulic systems and driveline components. Not sure which options are right for your build? Contact our tech team for concierge service to ensure the perfect setup for your project and budget.

What's Included

This is a fully customizable package. Select from the following component categories based on your application:

  • Transmission: TREMEC TKX 5-speed (choice of Wide, Close, or Close with 0.81 OD gear ratios)
  • Bellhousing: BOP-pattern bellhousing options
  • Hardware Kit: TKX-to-BOP aluminum bellhousing hardware
  • Flywheel: Oldsmobile engine flywheels (early or late balance options)
  • Flywheel Bolts: ARP flywheel bolt sets
  • Clutch Kit: Multiple hydraulic-compatible clutch sets from leading manufacturers
  • Pressure Plate Bolts: Standard or ARP pressure plate bolts
  • Clutch Pedal Assembly: Complete hydraulic clutch pedal
  • Pedal Pad Kit: Replacement pedal pads
  • Master Cylinder Kit: Hydraulic master cylinder (multiple color options)
  • Hydraulic Release Bearing: Self-contained hydraulic throwout bearing
  • Hydraulic Line: 24-inch braided stainless hydraulic hose
  • Shift Components: Shift knobs, levers, boots, and thread adapters
  • Speedometer Components: Cable adapters, driven gears, clips, and electronic sensors
  • Reverse Light Harness: Plug-and-play wiring harness
  • Crossmember: Application-specific transmission crossmember
  • Transmission Mount: Polyurethane transmission mount
  • Transmission Fluid: High-performance manual transmission fluid
  • Slip Yoke: 31-spline slip yokes (1310, 1330, or 1350 U-joint sizes)
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