TREMEC TKX 5-Speed Conversion Package | 1966-1967 Chevy II | LS Engine

TREMEC TKX 5-Speed Conversion Package | 1966-1967 Chevy II | LS Engine

TREMEC TKX 5-Speed Conversion Package | 1966-1967 Chevy II | LS Engine

Description

Key Features

  • TREMEC TKX 5-speed rated at 600 lb-ft torque capacity across all gear ratio configurations
  • Safe shifts at 7,500 RPM with engine speeds to 8,000 RPM - built for high-revving LS power
  • 26-spline input shaft and 31-spline output shaft for maximum strength
  • Compact end-loading case design fits GM A-body and X-body tunnels with minimal modifications
  • Sintered bronze/carbon hybrid multi-cone synchronizers deliver smooth, precise shifts at any RPM
  • Three-piece ribbed aluminum housing provides structural stiffness and reduced weight
  • Bolts to standard GM Muncie bellhousing pattern - direct 4-speed replacement geometry
  • Complete guided package builder - select every component for your specific LS/Chevy II combination
  • Multiple gear ratio options: wide-ratio (3.27 First) or close-ratio (2.87 First) with 0.68, 0.72, or 0.81 overdrive
  • 2.7-quart fluid capacity - compact and efficient design

Description

Converting your '66-'67 Chevy II from an automatic to a modern 5-speed manual transforms the entire driving experience - and when you're running LS power, you need a transmission engineered for serious torque and high-RPM shifts. The TREMEC TKX delivers exactly that: 600 lb-ft torque capacity, safe 7,500 RPM shifts, and the kind of crisp, precise engagement that older brass-synchro transmissions simply can't match. This complete package gives you everything needed to swap your X-body from slushbox to stick.

The TKX was designed from the ground up as an aftermarket transmission - not adapted from OE production. Its revolutionary end-loading case is narrower and shorter than previous 5-speeds, fitting early GM A-body and X-body tunnels with minimal floorpan work. The three-piece ribbed aluminum housing (main case, intermediate plate, and rear extension) delivers outstanding structural stiffness while keeping weight down. Inside, all gears and shafts are machined from special-grade ASTM 4615 steel with oversized gear widths for increased torque capacity and longevity. Sintered bronze/carbon hybrid multi-cone synchronizers eliminate the notchy, balky shifting that plagued older transmissions at high RPM - you get smooth engagement whether you're cruising at 2,000 or banging gears at 7,500.

MDL's guided package builder walks you through every component choice for your specific application. Start with your TKX gear ratio preference - wide-ratio with a 3.27 First for strong launches or close-ratio with a 2.87 First for tighter spacing - then select from LS-specific bellhousings (hydraulic or mechanical release), single or dual-disc clutch systems, LS flywheels for your specific crankshaft (LS1/2/3/6/7, LSX, LS9), hydraulic master cylinders and release bearings, a custom Chevy II crossmember, and all the supporting hardware. Every option is engineered to work together as a system, not cobbled from mismatched parts.

The TKX uses the same bellhousing bolt pattern as GM 3-speed and 4-speed Muncie transmissions, making it a direct geometry replacement for those classic gearboxes. The 31-spline output shaft accepts Ford C6-style slip yokes in 1310, 1330, or 1350 U-joint sizes. With single overdrive reducing highway RPM for better fuel economy and reduced NVH, this package puts modern transmission technology behind your LS-swapped Chevy II without sacrificing the classic driving experience.

What's Included

  • Your choice of TREMEC TKX 5-speed transmission (multiple gear ratio configurations available)
  • Bellhousing options - hydraulic or mechanical clutch release configurations for LS engines
  • Bellhousing block plate for proper LS engine fitment
  • Hardware kit - aluminum or steel options for TKX/LS applications
  • Flywheel selection - LS1/2/3/6/7, LSX, or LS9 crankshaft configurations
  • Grade 8 or ARP flywheel bolts (6-bolt, 8-bolt, or 9-bolt patterns available)
  • Clutch kit options - single or dual-disc configurations in various torque capacities
  • LS pilot bushing
  • Clutch pedal assembly for automatic-to-manual conversion
  • Pedal pad kit - deluxe or medium black finish options
  • Hydraulic master cylinder kit
  • Hydraulic release bearing
  • Hydraulic clutch line (24-inch)
  • Shift knob/ball options - multiple materials and MDL-branded versions available
  • Shift knob thread adapters (3/8-16 or 3/8-24)
  • Shift lever options - Hurst or custom MDL configurations
  • Shift boot - ribbed or smooth styles
  • Speedometer cable adapter
  • Speedometer driven gear (16-21 tooth options based on rear axle ratio)
  • Speedometer gear retaining clip
  • Electronic speedometer sensor option
  • Reverse light wiring harness
  • Custom crossmember for 1966-1967 Chevy II TKX fitment
  • Transmission mount
  • TREMEC HP-MTF transmission fluid (3 quarts)
  • 31-spline driveshaft yoke - 1310, 1330, or 1350 U-joint options (forged steel or forged chromoly available)
  • Lifetime technical support
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