TCI 6x 6-Speed GM 4L80E Automatic Transmission Packages 271701P39

Description

About This Transmission Package

Modern high-performance vehicles require a transmission capable of handling substantial horsepower while providing both acceleration and drivability.

The TCI 6x 6-Speed GM 4L80E transmission package was developed to address these demands by combining proven 4L80E strength with a sophisticated six-speed gear arrangement. The result is a transmission capable of supporting aggressive performance builds while improving cruising comfort and fuel economy.

Designed for applications producing up to 850 horsepower, this transmission package offers an excellent balance of strength, versatility, and modern electronic control. Whether used in a pro touring car, street machine, restomod, drag-and-drive build, or custom performance project, the TCI 6x provides performance-oriented shifting with everyday usability.

Unlike many transmission options that require separate component sourcing, this package includes the major components necessary for installation and operation.

Compatible Vehicles and Applications

The TCI 271701P39 package is designed for Ford applications and includes a small block Ford bellhousing.

Common applications include:

• Ford small block performance builds
• Ford restomod projects
• Pro touring vehicles
• High-performance street cars
• Race vehicles
• Custom performance builds
• Street and strip applications
• Drag-and-drive vehicles

Compatibility should always be verified before ordering to ensure proper installation and drivetrain integration.

Six Forward Gears for Improved Performance

One of the biggest advantages of the TCI 6x transmission is its six-speed configuration.

Gear ratios include:

• 1st Gear: 2.97:1
• 2nd Gear: 2.31:1
• 3rd Gear: 1.57:1
• 4th Gear: 1.18:1
• 5th Gear: 1.00:1
• 6th Gear: 0.75:1

This wider ratio spread provides several important benefits:

• Quicker acceleration
• Improved launch performance
• Better powerband utilization
• Reduced cruising RPM
• Enhanced highway drivability
• Improved fuel economy

For enthusiasts seeking both performance and long-distance comfort, the six-speed design offers a significant advantage over traditional three- and four-speed transmissions.

Built to Handle Serious Horsepower

The TCI 6x is designed for demanding applications producing up to 850 horsepower.

This makes it suitable for:

• High-output naturally aspirated engines
• Supercharged combinations
• Turbocharged builds
• Nitrous-assisted applications
• Performance street cars
• Competition vehicles

The transmission’s foundation is based on the proven 4L80E architecture, which has long been respected for its strength and durability.

Combined with TCI’s engineering enhancements, the result is a transmission capable of handling substantial power while maintaining dependable operation.

Modern Electronic Control System

A major advantage of this package is the included EZ-TCU transmission controller.

The electronic control system allows:

• Precise shift scheduling
• Transmission tuning flexibility
• Consistent shift quality
• Simplified installation
• Improved drivability

The package also includes the required wiring harnesses, helping simplify installation and integration into custom vehicle builds.

This level of electronic control allows drivers to optimize transmission performance for their specific application.

Included Components

The TCI 271701P39 package includes numerous components that help streamline installation.

Included components:

• Remanufactured 6-Speed 4L80E Transmission
• EZ-TCU Transmission Controller
• Wiring Harnesses
• Small Block Ford Bellhousing
• 28 oz. External Balance Flywheel
• TCI Paddle Shifter
• Transmission Cooler
• Dipstick
• Flexplate
• 12 Quarts of Transmission Fluid

These included components reduce the need for additional purchases and help create a more complete installation package.

Built for Street, Pro Touring, and Racing Applications

One of the reasons the TCI 6x has become popular among enthusiasts is its versatility.

The transmission is well suited for:

• Pro touring builds
• Street performance vehicles
• Restomods
• Drag-and-drive cars
• Autocross applications
• Track-day vehicles
• Custom performance projects

Its compact design allows it to fit a wide variety of applications while delivering the strength necessary for serious horsepower levels.

Is This Transmission Right for Your Build?

The TCI 6x 6-Speed GM 4L80E Automatic Transmission Packages 271701P39 is an excellent choice for:

• Ford performance enthusiasts
• Pro touring builders
• Restomod projects
• High-horsepower street cars
• Race vehicle builders
• Custom fabrication shops
• Performance restoration projects

It is particularly beneficial for drivers seeking improved acceleration, reduced cruising RPM, and modern transmission control technology.

Technical Specifications

This transmission package combines advanced electronic control with proven heavy-duty transmission architecture.

Key specifications include:

• Manufacturer: TCI Auto
• Part Number: 271701P39
• Product Line: TCI 6x 6-Speed
• Transmission Type: Automatic
• Condition: Remanufactured
• Number of Gears: 6
• Bellhousing Pattern: Ford
• Shift Pattern: Forward
• Valve Body Style: Automatic
• Horsepower Rating: 850 HP
• First Gear Ratio: 2.97:1
• Transmission Case Material: Aluminum
• Transmission Case Finish: Natural
• Transmission Pan Material: Steel
• Transmission Pan Finish: Chrome
• Fluid Fill Location: Case
• Fluid Included: Yes
• Fluid Quantity Included: 12 Quarts
• Dipstick Included: Yes
• Controller Included: Yes
• Wiring Harness Included: Yes
• Cooler Included: Yes
• Flexplate Included: Yes
• Paddle Shifter Included: Yes

Not Included:

• Torque Converter
• Trans-Brake

Purchase and Support Information

Selecting the right transmission package is a critical part of any performance build.

Before ordering, buyers should verify:

• Engine compatibility
• Vehicle fitment
• Installation requirements
• Converter requirements
• Drivetrain specifications

Our team is available to assist with compatibility verification and product selection to help ensure you choose the correct transmission package for your project.

Customers may also wish to explore our performance transmission collection, torque converters, drivetrain upgrades, and related performance components.

Frequently Asked Questions

How much horsepower can the TCI 271701P39 handle?

This transmission package is rated for applications producing up to 850 horsepower.

How many gears does this transmission have?

The TCI 6x features six forward gears designed to improve acceleration and cruising efficiency.

Does this package include a transmission controller?

Yes. An EZ-TCU transmission controller and wiring harnesses are included.

Is a paddle shifter included?

Yes. The package includes a TCI paddle shifter for enhanced driver control.

Does this package include transmission fluid?

Yes. Twelve quarts of transmission fluid are included.

Is a torque converter included?

No. The torque converter must be purchased separately.

What types of vehicles is this transmission best suited for?

The TCI 6x is ideal for pro touring vehicles, street performance cars, race vehicles, restomods, and high-horsepower custom builds.