TREMEC TKX 5-Speed Package | 1964-1966 GTO/Oldsmobile/Buick A-Body

TREMEC TKX 5-Speed Package | 1964-1966 GTO/Oldsmobile/Buick A-Body

TREMEC TKX 5-Speed Package | 1964-1966 GTO/Oldsmobile/Buick A-Body

Description

TREMEC TKX 5-Speed Package | 1964-1966 GTO/Oldsmobile/Buick A-Body

Key Features

  • 600 lb-ft torque capacity handles serious power from built BOP engines
  • Compact end-loading case design fits A-body tunnels without modification
  • 26-spline input shaft with 31-spline output shaft for maximum strength
  • 8,000 RPM redline capability with safe shifts at 7,500 RPM
  • Bolts to OEM BOP four-speed bellhousings - direct replacement fitment
  • Three gear ratio configurations available: wide ratio (3.27 first), close ratio (2.87/0.81), or deep overdrive (2.87/0.68)
  • Multi-cone hybrid synchronizers with sintered bronze and carbon for smooth high-RPM shifts
  • Fully customizable package builder - select transmission, bellhousing, clutch, hydraulics, and accessories
  • 99 lbs dry weight - lighter than most high-capacity 5-speeds

Description

Your '64-'66 GTO, Cutlass, or Skylark deserves more than a tired Muncie four-speed or that sluggish two-speed Super Turbine automatic. The TREMEC TKX 5-speed delivers what those original transmissions never could: 600 lb-ft of torque capacity, an overdrive gear for highway cruising, and shift capability at 7,500 RPM - all in a case specifically designed to fit classic muscle car tunnels without cutting.

TREMEC engineered the TKX from the ground up as an aftermarket transmission, not a repurposed OE unit. The three-piece ribbed aluminum housing provides outstanding structural stiffness while the end-loading design creates a slimmer profile than traditional side-cover transmissions. All gears and shafts are machined from special-grade ASTM 4615 steel with wide gear widths for increased torque capacity and extended service life. Multi-cone synchronizers with hybrid sintered bronze and carbon rings eliminate the notchy, vague feel of older transmissions while enabling clean shifts even under load.

The TKX bolts directly to OEM GM four-speed bellhousings using the factory BOP bolt pattern - no adapter plates or case machining required. The side-mounted shifter maintains your factory shifter location for that stock appearance. Tapered roller bearings on input, output, and countershafts reduce noise while caged needle bearings at all gear positions ensure durability. Gaskets at all flanges simplify installation and eliminate fluid leaks common with older transmissions.

This fully customizable package builder walks you through every component selection: transmission gear ratio, bellhousing, clutch kit matched to your engine output, hydraulic conversion system, flywheel with correct crank register, speedometer adaptation, crossmember mounting, and driveshaft yoke. Every component is specifically selected for 1964-1966 Pontiac GTO, Oldsmobile Cutlass/442, and Buick Skylark A-body platforms equipped with original BOP engines. MDL lifetime technical support included.

What's Included

Customizable package - select your components:

  • TREMEC TKX 5-speed transmission (wide ratio, close ratio, or deep overdrive configurations)
  • BOP-pattern bellhousing (aluminum or cast iron options)
  • Bellhousing-to-transmission hardware kit
  • Clutch kit with pressure plate, disc, and hydraulic release bearing
  • SFI-spec flywheel (early or late Oldsmobile crank register options)
  • ARP flywheel bolt set
  • Pressure plate bolt set (standard or ARP)
  • Hydraulic clutch master cylinder kit
  • Hydraulic release bearing
  • Braided stainless hydraulic line
  • Clutch pedal pad kit
  • Shift lever with choice of throw length
  • Shift knob (multiple styles and finishes)
  • Shift boot
  • Speedometer cable adapter and driven gear
  • Speedometer gear retaining clip
  • Electronic speedometer sensor (optional)
  • Reverse light wiring harness
  • Transmission crossmember
  • Polyurethane transmission mount
  • Transmission fluid
  • Driveshaft slip yoke (1310, 1330, or 1350 series options)
  • Installation instructions
  • MDL lifetime technical support
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Final step

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