TREMEC TKX 5-Speed Conversion Package | 1978-1988 GM G-Body | Small Block Chevy

TREMEC TKX 5-Speed Conversion Package | 1978-1988 GM G-Body | Small Block Chevy

TREMEC TKX 5-Speed Conversion Package | 1978-1988 GM G-Body | Small Block Chevy

Description

Key Features

  • 600 lb-ft torque capacity with 8,000 RPM capability and smooth shifts at 7,500 RPM
  • 26-spline input shaft and 31-spline output shaft for maximum drivetrain strength
  • End-loading case design provides slimmer profile for superior tunnel clearance in G-Body applications
  • All gears and shafts machined from special-grade steel (ASTM 4615) for increased durability
  • Hybrid triple-cone synchronizers with sintered bronze and carbon rings for crisp high-RPM shifts
  • Three-piece ribbed aluminum housing delivers outstanding structural stiffness
  • 31-spline output shaft uses Ford C6-style slip yokes for proven driveline strength
  • Bolts directly to standard GM Muncie bellhousing pattern
  • Complete customizable package - select transmission gear ratios, bellhousing, clutch, hydraulics, and accessories to match your build
  • Professional guided selection process with concierge service available

Description

The GM G-Body platform (1978-1988) includes some of the most iconic rear-wheel-drive muscle of the era - Monte Carlo, Malibu, El Camino, Cutlass Supreme, Buick Regal, and Pontiac Grand Prix. These cars represent the last generation to follow the classic front-engine, rear-drive muscle car formula, and they deserve a modern drivetrain to match. This complete TREMEC TKX conversion package eliminates the guesswork of sourcing compatible components for your Small Block Chevy-powered G-Body, providing everything needed to swap in a modern 5-speed manual.

The heart of this package is the TREMEC TKX, the next evolution of the 5-speed designed specifically for the aftermarket. Rated at 600 lb-ft across all gear ratio configurations, the TKX delivers single overdrive efficiency that reduces highway RPM, improves fuel economy, and transforms the driving experience. The all-new end-loading case design provides a slimmer profile than previous transmissions, improving tunnel clearance in tight GM A-body and G-Body applications. Case mounting and rear crossmember locations remain the same as the previous TKO, making this a straightforward swap with dramatically improved shift quality and durability.

Inside, TREMEC engineers specified wide gear widths, special-grade ASTM 4615 steel for all gears and shafts, and hybrid triple-cone synchronizers with sintered bronze and carbon rings - engineering choices that enable confident 7,500 RPM shifts with a smooth, precise feel. The three-piece ribbed aluminum housing provides structural stiffness while keeping weight down, and gaskets at all flanges eliminate fluid leaks. A robust internal three-rail shift system with steel shift forks ensures crisp engagement gear after gear.

Every component in this package is selected specifically for G-Body applications and Small Block Chevy engines. Choose from multiple TKX gear ratio options (wide ratio with 3.27 first gear or close ratio with 2.87 first gear), bellhousings for various SBC configurations, clutch systems matched to your power level, hydraulic release systems, and accessories including shifters, speedometer adapters, transmission mounts, and slip yokes. MDL's guided selection process walks you through every choice, with technical support available at every step.

What's Included

This package is completely customizable. Select components based on your specific engine, power level, and preferences:

  • TREMEC TKX 5-Speed Transmission - Choice of gear ratios: 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)
  • Bellhousing Options - Multiple choices for Small Block Chevy applications
  • Bellhousing Block Plate - Reinforcement plate for added safety
  • Hardware Kit - Bellhousing bolts and installation hardware
  • Flywheel Selection - Multiple options for various SBC engines and balance requirements
  • Flywheel Bolts - ARP high-strength or standard grade options
  • Clutch Systems - Single and dual-disc options from leading manufacturers
  • Pressure Plate Bolts - Standard or ARP hardware
  • Hydraulic Master Cylinder Kits - Multiple bore sizes and configurations
  • Hydraulic Lines - Pre-made braided stainless lines
  • Shifter Options - Stock position, offset, and performance shifters including Hurst and custom MDL units
  • Shift Knobs - Various materials, colors, and MDL-branded options
  • Speedometer Components - Cable adapters, driven gears, clips, and electronic sensors
  • Transmission Fluid - TREMEC HP-MTF or ATF as required (2.7 quart capacity)
  • Reverse Light Wiring Harness
  • Clutch Pedal Pad Kits
  • Transmission Mount
  • Tunnel Modification Kit - If required for specific applications
  • Driveshaft Slip Yokes - 31-spline in multiple U-joint sizes (1310, 1330, 1350)
  • Installation Instructions and Technical Support
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Final step

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