TKX 5-Speed Conversion Package | Ford FE 352-390-427-428

TKX 5-Speed Conversion Package | Ford FE 352-390-427-428

TKX 5-Speed Conversion Package | Ford FE 352-390-427-428

Description

TKX 5-Speed Conversion Package | Ford FE 352-390-427-428

Key Features

  • 600 lb-ft torque capacity with 7,500 RPM shift capability - handles serious FE big block power
  • Compact end-loading design delivers a slimmer case profile for improved tunnel clearance without floor modifications
  • 26-spline input shaft with 31-spline output shaft for enhanced drivetrain strength over stock four-speeds
  • Three shifter locations provide mounting flexibility to maintain stock shifter position and feel
  • Multi-cone synchronizers with hybrid sintered bronze/carbon rings for smooth, precise high-RPM shifts
  • Three-piece ribbed aluminum housing provides structural stiffness with gaskets at all flanges to eliminate leaks
  • Multiple gear ratio configurations - wide ratio (3.27, 1.98, 1.34, 1.00, 0.72) and close ratio (2.87, 1.89, 1.28, 1.00, 0.68 or 0.81) options
  • Fully customizable package builder - select transmission, bellhousing, clutch, hydraulics, and accessories matched to your FE build
  • Built-in reverse light switch and cruise control safety switch for simplified wiring integration

Description

Ford FE big blocks - the 352, 360, 390, 406, 410, 427, and 428 - defined an era of American performance, but finding a modern five-speed that bolts up cleanly has always been a challenge. The TREMEC TKX solves that problem with 600 lb-ft of torque capacity and the ability to shift at 7,500 RPM, delivering the durability and performance your FE deserves while fitting where lesser transmissions won't.

TREMEC designed the TKX from the ground up specifically for the aftermarket. The compact end-loading architecture creates a slimmer case profile than the TKO it replaces, fitting into tight transmission tunnels without the floor modifications that plagued earlier five-speed swaps. The three-piece ribbed aluminum housing - main case, intermediate plate, and rear extension - provides outstanding structural stiffness while gaskets at every flange eliminate the leak points common on older designs. Inside, multi-cone synchronizers with hybrid sintered bronze and carbon rings deliver the smooth, precise shifts that high-RPM FE combinations demand.

The TKX bolts directly to Ford four-speed bellhousing patterns, making it a straightforward upgrade path from your Top Loader, T-10, or other factory four-speed. The 31-spline output shaft accepts Ford C6-style slip yokes, maintaining compatibility with common driveline components. Three shifter mounting locations allow you to position the lever exactly where the factory stick sat, preserving the authentic driving experience while adding modern shift quality and an overdrive gear that drops highway RPM and extends engine life.

This MDL package system walks you through every component required for a complete FE conversion. Start by selecting your preferred TKX gear ratio configuration, then add the QuickTime RM-6056 bellhousing (standard or SFI-certified), your choice of billet steel flywheel for 390 or 428 applications, hydraulic clutch system, and all the supporting accessories. Our guided selection process ensures every component works together, and our technical support team stands behind your build from first bolt to first burnout.

Package Components Available

  • TREMEC TKX Transmissions: Wide ratio (3.27, 1.98, 1.34, 1.00, 0.72) or close ratio (2.87, 1.89, 1.28, 1.00, 0.68 or 0.81) configurations with 26-spline input
  • QuickTime Bellhousings: RM-6056 Ford FE to TKX/TKO pattern - standard steel or SFI 6.1 certified versions
  • Hardware Kits: Complete Ford TKO/TKX startup hardware with all required fasteners and alignment components
  • Billet Steel Flywheels: Application-specific options for 390 and 428 with correct balance
  • Flywheel Bolts: ARP fasteners for secure crankshaft attachment
  • Clutch Sets: 11-inch hydraulic-compatible options from McLeod, Centerforce, and King Cobra with 26-spline disc
  • Pressure Plate Bolts: Standard Grade 8 and ARP options
  • Hydraulic Master Cylinders: Multiple bore sizes and firewall mounting configurations
  • Hydraulic Lines: -4AN stainless braided lines in application-specific lengths
  • Hydraulic Release Bearings: Bolt-on hydraulic throwout bearing assemblies
  • Shifters and Components: Hurst and MDL shift levers, billet knobs, leather boots, and trim bezels
  • Speedometer Solutions: Mechanical cables, driven gears (16-21 tooth), clips, and electronic VSS sensors
  • Wiring Harnesses: Reverse light pigtails for plug-and-play integration
  • Transmission Mounts: Direct-fit crossmember mount pads
  • Fluids: TREMEC HP-MTF synthetic or Dexron III ATF - 2.7 quart capacity
  • Driveshaft Yokes: 31-spline slip yokes in 1310, 1330, and 1350 U-joint series
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