TREMEC T56 Magnum 6-Speed Conversion Package | 1977-1979 Corvette | LS Engine

TREMEC T56 Magnum 6-Speed Conversion Package | 1977-1979 Corvette | LS Engine

TREMEC T56 Magnum 6-Speed Conversion Package | 1977-1979 Corvette | LS Engine

Description

Key Features

  • 700 lb-ft torque capacity - handles serious LS power with confidence
  • Double overdrive ratios (0.74 5th, 0.50 6th available) - significantly reduces highway RPMs for improved fuel economy and reduced engine wear
  • 26-spline input shaft with 31-spline output shaft - robust power transfer for high-horsepower builds
  • Triple-cone synchronizers on 1st-4th gears - delivers crisp, precise shifts every time
  • Dual speedometer pickups - works with mechanical or electronic speedometers
  • 135 lb dry weight - minimal weight penalty over original 4-speed
  • 3.66 quart fluid capacity - uses Dexron III ATF or TREMEC HP-MTF
  • Customizable package - select transmission gear ratios, bellhousing, clutch, hydraulics, and accessories to match your build
  • Fiberglass tunnel extension included - bonds to OEM body for proper Magnum case clearance

Description

The C3 Corvette is a stunning chassis with excellent handling, but the smog-era small-blocks from '77-'79 leave serious performance on the table. Converting your Corvette to an LS V8 paired with a TREMEC T56 Magnum 6-speed is the ultimate restomod upgrade, and this customizable package delivers everything needed for a professional installation. The Magnum takes the best from TREMEC's current OEM technologies - the same architecture found in the Dodge Viper and Chevrolet Camaro - and packages it for classic car conversions.

Capable of handling 700 lb-ft of torque, the Magnum features increased face-width on all gears, 4616 chromoly gears and shafts, and a one-piece countershaft that eliminates the torque limitations of earlier two-piece designs. The double overdrive setup transforms highway driving - a 2.97 first gear provides strong launches while the deep overdrive ratios significantly reduce engine RPM compared to the original 4-speed. Triple-cone synchronizers on 1st through 4th gears deliver the crisp, precise shifts the Magnum is known for, while laser-beam welded gear construction ensures accurate tooth angles and positive stops to prevent over-travel during aggressive shifting.

Because the Magnum case is larger than the original transmission, tunnel modifications are required for proper clearance. This package includes a fiberglass tunnel extension designed to bond with the original body, providing the necessary space while maintaining structural integrity. The guided package selection process walks you through choosing the optimal transmission gear ratios, bellhousing, clutch setup, hydraulic components, shifter, speedometer adapters, wiring harnesses, and driveshaft modifications specific to your LS engine and performance goals.

Every component is selected for compatibility with LS-powered C3 Corvettes, from the bellhousing bolt pattern to the pilot bushing requirements. Whether you're building a weekend cruiser or a serious performer, this customizable package provides the foundation for a bulletproof 6-speed conversion that delivers modern drivability in your classic Corvette. MDL offers concierge service to help you make the right part selections for your project and budget.

Package Components (Customizable Selection)

  • Transmission: Choice of TREMEC T56 Magnum variants with different gear ratio configurations
  • Bellhousing: LS-specific aluminum bellhousings with hydraulic or mechanical clutch provisions
  • Hardware Kit: Transmission-to-bellhousing mounting hardware in aluminum or steel
  • Flywheel: LS-specific flywheels for various engine configurations
  • Flywheel Bolts: High-strength bolts including ARP options
  • Clutch System: Complete clutch kits from single-disc to twin-disc configurations
  • Pilot Bushing: LS-specific pilot bushings including bronze alternatives
  • Clutch Pedal Assembly: Hydraulic clutch pedal conversion
  • Hydraulic Line: 24-inch stainless steel braided hydraulic line
  • Shift Lever: Precision shift lever assembly
  • Shift Boot: Rubber shift boot for console installation
  • Speedometer Components: Cable adapters, driven gears, gear clip, and electronic harness
  • Reverse Lockout: Electronic reverse lockout controller with solenoid and light harnesses
  • Transmission Tunnel: Fiberglass tunnel extension for Magnum case clearance
  • Transmission Mount: Custom crossmember for C3 Corvette chassis mounting
  • Driveshaft: Custom driveshaft with 1350-series U-joints
  • Transmission Fluid: 4 quarts of recommended ATF
  • Installation Support: Detailed instructions and MDL technical assistance
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