Description

Overview

The FTI Performance TH400 Level 4 Transmission TH400-4S is a professional-grade automatic transmission designed for vehicles that demand strong drivetrain performance and dependable power transfer.

The GM Turbo-Hydramatic 400 transmission, commonly known as the TH400, is one of the most respected automatic transmission platforms in the automotive performance industry. Known for its strong internal components and simple design, the TH400 has been widely used in racing, muscle cars, and high-performance builds for decades.

FTI Performance builds upgraded TH400 transmissions designed to handle increased horsepower and torque levels that exceed the capabilities of factory transmissions.

The FTI Performance TH400 Level 4 Transmission TH400-4S is engineered to deliver reliable performance for demanding applications.

Vehicles and Performance Applications

The FTI Performance TH400 Level 4 Transmission TH400-4S is designed for vehicles requiring a durable automatic transmission capable of handling high engine output.

Typical applications include:

• drag racing vehicles
• high-horsepower street cars
• classic muscle car builds
• custom performance vehicles
• engine swap projects
• racing and competition vehicles

Because transmission compatibility depends on drivetrain configuration, engine setup, and vehicle chassis design, verifying compatibility before installation is recommended.

Build Quality and Internal Engineering

The FTI Performance TH400 Level 4 Transmission TH400-4S is built using performance-grade internal components designed to withstand demanding driving conditions.

Automatic transmissions contain several systems responsible for transferring engine power and controlling gear changes.

Key components include:

• planetary gear sets
• high-performance clutch packs
• reinforced internal transmission components
• hydraulic valve body assembly
• heavy-duty transmission case

These components work together to deliver reliable gear changes and efficient power transfer during both street driving and competitive racing conditions.

Performance transmissions such as the TH400 Level 4 are commonly used in vehicles producing significant horsepower and torque.

Why Performance Builders Choose the TH400 Platform

The FTI Performance TH400 Level 4 Transmission TH400-4S remains a popular choice among performance builders because the TH400 platform has proven reliability in demanding environments.

Builders often select TH400 transmissions because they offer:

• strong torque handling capability
• dependable gear engagement
• durable internal transmission components
• compatibility with high-horsepower engines

Because of its proven design and strong internal structure, the TH400 platform continues to be widely used in racing and high-performance automotive applications.

Who This Transmission Is Designed For

The FTI Performance TH400 Level 4 Transmission TH400-4S is designed for buyers who require a dependable automatic transmission capable of handling high performance demands.

Typical buyers include:

• performance vehicle builders
• drag racing enthusiasts
• automotive mechanics specializing in drivetrain upgrades
• classic muscle car restorers
• custom automotive builders

This transmission is particularly suitable for vehicles producing significant horsepower where standard factory transmissions may not provide sufficient durability.

Transmission Specifications

The FTI Performance TH400 Level 4 Transmission TH400-4S is engineered for dependable high-performance drivetrain operation.

Key specifications include:

• Transmission Type: Automatic transmission
• Transmission Platform: GM Turbo-Hydramatic 400 (TH400)
• Manufacturer: FTI Performance
• Model Number: TH400-4S
• Application: High-performance street and racing vehicles

The transmission integrates with compatible drivetrain components including the engine, driveshaft, torque converter, and vehicle drivetrain systems.

Compatibility should always be verified before installation.

Ordering and Support

Ordering the FTI Performance TH400 Level 4 Transmission TH400-4S provides a dependable drivetrain solution for vehicles requiring a high-strength automatic transmission.

Before purchasing a performance transmission, it is recommended to confirm:

• drivetrain configuration
• engine compatibility
• torque converter compatibility
• transmission mounting requirements

Professional drivetrain suppliers often assist customers in verifying the correct transmission configuration before purchase.

With proper installation and routine maintenance, a performance transmission can deliver dependable operation for many years.

Frequently Asked Questions

What is the TH400 transmission?

The TH400 is a heavy-duty automatic transmission originally developed by General Motors and widely used in performance and racing vehicles.

Why is the TH400 popular for performance builds?

The TH400 transmission is known for strong internal components and the ability to handle high horsepower and torque levels.

Can the TH400 transmission be used in racing?

Yes. The TH400 platform is commonly used in drag racing and high-performance automotive builds.

What does Level 4 transmission mean?

Level 4 typically refers to a higher-strength build configuration designed to handle increased horsepower and demanding driving conditions.

How do I confirm this transmission fits my vehicle?

Compatibility should be verified using drivetrain configuration, engine setup, and transmission mounting requirements.

FTI Performance TH400 Level 4 Transmissions

FTI Performance TH400 Level 4 transmissions feature a full manual valve body equipped with a transbrake for the ultimate drag racer. They make an excellent choice for weekend bracket racers, high-powered street cars, and mud trucks. The transmissions have: a 34-element intermediate sprag, performance clutches and steels, high-flow pump, race-prepped stock case, deep aluminum pan, billet forward clutch hub, heavy-duty intermediate retainer, and a 4-clutch intermediate pack. Some models are compatible with Ultra Bell bellhousings.