SBC 85-older Tremec T56 6 Speed Transmission Install Kit, 700 HP

The SBC 85 & Older Tremec T56 6-Speed Transmission Install Kit, 700 HP is a complete manual transmission conversion package engineered for 1955–1985 Small Block Chevrolet engines equipped with a 2-piece rear main seal. Centered around the legendary TREMEC T56 Magnum 6-speed transmission, this kit delivers exceptional strength, smooth high-RPM shifting, and modern double-overdrive performance for classic muscle cars, hot rods, trucks, and pro-touring builds. It is designed to simplify the conversion process by including nearly everything required to install a T56 behind your classic Small Block Chevy.

Rated to handle 700 lb-ft of torque and capable of shifting up to 7,800 RPM, the T56 Magnum features premium carbon and bronze synchronizers, a heavy-duty 26-spline input shaft, and a 31-spline output shaft for superior durability. The included steel bellhousing, performance clutch, billet steel flywheel, hydraulic release bearing, pilot bearing, and installation hardware make this one of the most complete and reliable manual transmission conversion kits available.

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Features

• Complete Small Block Chevy T56 Magnum conversion kit
• Fits 1955–1985 Chevy Small Block V8 engines with 2-piece rear main seal
• Genuine TREMEC T56 Magnum 6-speed manual transmission
• Rated for 700 lb-ft of torque
• Smooth shifting up to 7,800 RPM
• Double overdrive for improved highway cruising
• Heavy-duty aluminum transmission case
• Carbon and sintered bronze synchronizers
• Performance clutch rated for high-horsepower applications
• SFI-approved billet steel flywheel
• Steel bellhousing for maximum durability
• Hydraulic throwout bearing included
• Wiring pigtails for reverse light, reverse lockout, and electronic speedometer
• Ideal for street, pro-touring, and high-performance builds

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Gear Ratios

• 1st Gear: 2.66:1
• 2nd Gear: 1.78:1
• 3rd Gear: 1.30:1
• 4th Gear: 1.00:1
• 5th Gear: 0.80:1
• 6th Gear: 0.63:1
• Reverse: 2.90:1

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Specifications

• Brand: TREMEC
• Transmission Model: T56 Magnum
• Transmission Type: 6-Speed Manual
• Application: 1955–1985 Small Block Chevy (2-Piece Rear Main Seal)
• Torque Capacity: 700 lb-ft
• Maximum Shift RPM: 7,800 RPM
• Case Material: Aluminum
• Input Shaft Diameter: 1.125 inches
• Input Shaft Spline Count: 26
• Output Shaft Diameter: 1.375 inches
• Output Shaft Spline Count: 31
• Speedometer Output: Electronic
• Bellhousing Material: Steel
• Clutch Diameter: 10 Inches
• Flywheel: 168-Tooth SFI-Approved Billet Steel
• Shifter Style: Linkage Operated
• Fluid Capacity: Approximately 3.4 Quarts
• Recommended Fluid: Dexron III/Mercon ATF

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Kit Includes

• TREMEC T56 Magnum 6-Speed Manual Transmission
• Steel Bellhousing
• Performance Clutch Disc
• Heavy-Duty Pressure Plate
• SFI-Approved Billet Steel Flywheel
• Hydraulic Throwout Bearing
• Pilot Bearing
• Flywheel Bolts
• Pressure Plate Bolts
• Bellhousing Hardware
• Reverse Lockout Wiring Pigtail
• Reverse Light Wiring Pigtail
• Electronic Speedometer Wiring
• Installation Hardware

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Recommended Applications

Ideal for:

• Chevrolet Camaro
• Chevrolet Chevelle
• Chevrolet Nova
• Chevrolet El Camino
• Chevrolet C10 Pickup
• Chevrolet Bel Air
• Chevrolet Impala
• Chevrolet Biscayne
• Chevrolet 210
• Street Rods
• Hot Rods
• Pro-Touring Builds
• Restomod Projects
• High-Performance Street Cars

Compatible with 1955–1985 Small Block Chevy engines, including 283, 305, 307, 327, 350, 383 Stroker, and 400, equipped with a 2-piece rear main seal.

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Installation Requirements

Installation may require:

• Transmission crossmember
• 31-spline slip yoke
• Driveshaft length modification
• Hydraulic clutch master cylinder
• Transmission mount
• Clutch pedal assembly
• Dexron III/Mercon ATF
• Bellhousing alignment verification with offset dowel pins if required

Professional installation is recommended to ensure proper drivetrain alignment, clutch operation, and long-term reliability.

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Warranty

The SBC 85 & Older Tremec T56 6-Speed Transmission Install Kit, 700 HP is backed by a 1-Year Limited Warranty, covering defects in materials and workmanship under normal use and proper installation.

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Why Choose the SBC T56 Magnum Install Kit?

The SBC 85 & Older Tremec T56 6-Speed Transmission Install Kit provides everything needed to modernize your classic Small Block Chevy with one of the strongest and most respected manual transmissions available. Featuring a 700 lb-ft torque rating, double overdrive gearing, 7,800 RPM shift capability, SFI-approved billet flywheel, and a complete package of premium installation components, this kit delivers outstanding strength, smooth performance, excellent highway drivability, and race-proven reliability for street, pro-touring, and high-performance applications.