TKX 5-Speed Conversion Package | 1955-1957 Tri-5 Chevy | SBC/BBC

TKX 5-Speed Conversion Package | 1955-1957 Tri-5 Chevy | SBC/BBC

TKX 5-Speed Conversion Package | 1955-1957 Tri-5 Chevy | SBC/BBC

Description

Key Features

  • 600 lb-ft torque capacity across all TKX configurations
  • Multiple gear ratio options: 3.27:1 or 2.87:1 first gear with overdrive ratios from 0.68:1 to 0.81:1
  • 26-spline input shaft with 31-spline output shaft for maximum strength
  • Compact top-loader design fits restrictive Tri-5 transmission tunnel
  • Forward shifter position clears factory bench seat
  • Carbon-fiber hybrid synchronizers enable safe shifting at 7,500 RPM
  • Uses stock GM 3-speed and 4-speed Muncie bellhousing bolt pattern
  • Three-piece ribbed aluminum housing provides outstanding structural stiffness
  • Fully customizable package with guided component selection
  • Compatible with TREMEC HP-MTF, Dexron-III, or GM Synchromesh fluid

Description

Transform your 1955-1957 Tri-5 Chevy with this comprehensive TKX 5-speed manual transmission package designed specifically for small block and big block Chevy applications. The TKX's compact end-loaded design fits the restrictive Tri-5 transmission tunnel, and the forward shifter position maintains proper bench seat clearance - a critical consideration for these classic Chevys.

This isn't just another transmission swap - it's an engineered solution built from the ground up for the aftermarket. The TKX features enhanced gear sizes and double-lined carbon-fiber synchronizers that eliminate the stiff, notched feel of earlier transmissions. Case mounting and rear crossmember locations remain identical to TKO transmissions, making this a straightforward upgrade path. Choose from wide-ratio (3.27:1 first) or close-ratio (2.87:1 first) configurations, each delivering 600 lb-ft capacity with overdrive ratios that drop highway RPM and increase fuel efficiency without sacrificing acceleration.

Our guided package builder walks you through every component selection - from bellhousings and flywheels to hydraulic clutch systems and crossmembers. The TKX measures approximately 1-3/4 inches longer than a Muncie, requiring driveshaft modification, but the transmission uses the same bellhousing bolt pattern as your stock 3-speed or Muncie 4-speed. Every package includes selectable options for aluminum or cast iron bellhousings, steel or aluminum flywheels in various balance configurations, and complete clutch kits with hydraulic actuation.

Made in the USA by TREMEC with 100% brand-new OEM-quality components, this package delivers the reliability and performance your classic Chevy deserves. Our team provides lifetime technical support to ensure your installation succeeds.

What's Included

  • Your choice of TREMEC TKX 5-speed transmission (wide or close ratio)
  • Aluminum or cast iron bellhousing options
  • Bellhousing block plate
  • Steel or aluminum flywheel options with various balance configurations
  • ARP flywheel bolt set
  • Complete clutch kit selection with hydraulic actuation options
  • ARP or standard pressure plate bolt set
  • Clutch pedal and pedal pad options
  • Hydraulic master cylinder kit with stainless braided line
  • Hydraulic release bearing
  • Billet aluminum shift knob with thread adapter options
  • Shift lever selection
  • Shift boot options
  • Transmission hardware kit (aluminum or steel)
  • Speedometer cable adapter and driven gear
  • Speedometer gear retaining clip
  • Electronic speedometer sensor option
  • Reverse light wiring harness
  • Tri-5 specific transmission crossmember
  • Polyurethane transmission mount
  • 31-spline slip yoke (1310, 1330, or 1350 U-joint options)
  • TREMEC HP-MTF or ATF transmission fluid
  • Complete installation instructions
  • Lifetime technical support
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