TREMEC T56 Magnum 6-Speed Conversion Package | 1967 Chevelle | SB/BB Chevy

TREMEC T56 Magnum 6-Speed Conversion Package | 1967 Chevelle | SB/BB Chevy

TREMEC T56 Magnum 6-Speed Conversion Package | 1967 Chevelle | SB/BB Chevy

Description

Key Features

  • 700 lb-ft torque capacity - handles serious horsepower builds without compromise
  • Double overdrive ratios - 0.74 fifth and 0.50 sixth gear reduce highway RPMs dramatically
  • Multiple gear ratio options - 2.97 wide ratio or 2.66 close ratio first gear configurations
  • 26-spline input shaft, 31-spline output shaft - compatible with standard GM clutch assemblies
  • 135 lbs dry weight - minimal weight penalty over original 4-speed
  • Triple cone synchronizers on gears 1-4, double cone on 5-6 and reverse for crisp engagement
  • Complete conversion package - transmission, bellhousing, hydraulic system, shifter, and all supporting components
  • Customizable component selection - guided package builder lets you spec every part
  • Tunnel modification required - sheet metal extension kit available

Description

Transform your 1967 Chevelle with the ultimate drivetrain upgrade - a complete TREMEC T56 Magnum 6-speed conversion package engineered specifically for small block and big block Chevy applications. This package solves the age-old muscle car dilemma: how to get modern overdrive performance without sacrificing the driving experience that makes these cars legendary.

The T56 Magnum takes the best of TREMEC's current OEM design and manufacturing technologies - the same architecture found in the Dodge Challenger, Viper, and Chevrolet Camaro - and packages it for classic car applications. With a massive 700 lb-ft torque capacity while providing incredibly crisp shifts, no other manual transmission offers as much combined strength, versatility, and ease of use. The gears feature substantially increased face widths and 2-piece laser-beam welded construction, allowing for greater control of tooth angles, pitch, and alignment. The one-piece countershaft with thicker journals and widened gear faces delivers ultimate strength for high-torque applications.

The Magnum's double overdrive design provides two distinct advantages over single overdrive transmissions. The 0.74 fifth gear offers a cruising ratio that drops highway RPMs significantly, while the 0.50 sixth gear provides maximum fuel economy for long-distance touring. This means your Chevelle can pull down from 3,000+ RPM to under 2,000 RPM at highway speeds, dramatically reducing engine stress and improving fuel economy while maintaining the aggressive gear splits needed for performance driving.

Due to the Magnum's increased case size compared to original 4-speed transmissions, tunnel modifications are required. MDL offers a precision-engineered sheet metal tunnel extension that integrates with the original floor pan. Our guided package selection system walks you through every component choice - from bellhousing selection to hydraulic system configuration - ensuring your conversion is engineered for your specific engine and performance goals. If you have questions at any point, contact our team for concierge-level assistance in selecting the right parts for your project and budget.

Package Components Available

  • TREMEC T56 Magnum transmission - multiple gear ratio options available
  • Aluminum bellhousing - GM small/big block bolt pattern
  • Hardware kit - bellhousing bolts (aluminum or steel options)
  • Flywheel options - multiple configurations for LS applications
  • ARP flywheel bolts
  • Clutch assemblies - single or twin disc configurations with hydraulic actuation
  • Pilot bearing/bushing - for twin disc clutch applications
  • Pressure plate bolts - standard or ARP upgrade
  • Hydraulic clutch pedal - polished or black finish
  • Pedal pads and trim rings
  • Hydraulic master cylinder kit - multiple finish options (polished, black, chrome)
  • Hydraulic release bearing - concentric or external mount styles
  • Braided stainless hydraulic line - 24-inch -4AN
  • Shift knobs - multiple materials and custom MDL options
  • Shift knob thread adapters - 3/8-16 or 3/8-24
  • Shift levers - Hurst or custom options
  • Shift boots - leather or synthetic with optional reverse lockout
  • Speedometer components - cable adapters, driven gears (16-21 tooth), electronic sensors
  • Speedometer gear clip
  • Wiring harnesses - speedometer sensor and reverse lights
  • Reverse lockout controller with solenoid harness
  • Transmission mount - application-specific design
  • DEXRON ATF - 4 quarts for initial fill
  • Tunnel extension kit - precision sheet metal for case clearance
  • Drive shaft yokes - 1310, 1330, or 1350 series with 31-spline
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