FTI Performance TH400 Level 4 Transmissions TH400-4S

Description

FTI TH400 Level 4 Transmission Overview

The FTI Performance TH400 Level 4 Transmissions TH400-4S is a serious performance automatic transmission designed for vehicles that need more strength and control than a basic street transmission can provide.

This unit is part of the FTI Performance TH400 Level 4 Transmissions product line and is listed under Manufacturer’s Part Number TH400-4S, Summit Racing Part Number FTI-TH400-4S, and UPC 887753825568.

The FTI TH400-4S is listed as remanufactured and sold individually. It uses a Chevy bellhousing bolt pattern, 3 forward gears, a reverse shift pattern, and a full manual valve body. It also includes a trans-brake, making it especially valuable for drag racing applications where launch control and staging consistency matter.

With a 900 horsepower advertised rating, this transmission is built for properly matched high-powered street cars, weekend bracket racers, drag cars, and mud trucks. It combines TH400 durability with upgraded internal components designed for demanding use.

Vehicle Fitment and Common Applications

The FTI Performance TH400 Level 4 TH400-4S transmission is intended for compatible Chevy-pattern applications that require a TH400-style 3-speed automatic transmission with a Chevy bellhousing bolt pattern.

Fitment should be verified before purchase using the vehicle application, engine combination, bellhousing pattern, crossmember position, driveshaft length, yoke requirements, shifter setup, cooler line routing, converter selection, flexplate compatibility, and safety requirements.

This transmission uses a slip-on / bolt-on yoke style, 30-spline input, and TH350/400 input shaft style. These details should be compared with the drivetrain setup before ordering.

This unit does not include a torque converter, flexplate, transmission controller, wiring harness, transmission cooler, fluid, or dipstick. Buyers should plan those supporting parts separately.

The reverse shift pattern and full manual valve body also mean this transmission should be matched with the correct shifter and driver expectations. It is built for performance control rather than normal fully automatic street behavior.

Full Manual Valve Body and Reverse Shift Pattern

The full manual valve body is one of the most important features of the FTI TH400-4S. Unlike a standard automatic transmission, a full manual valve body gives the driver direct control over gear changes.

This setup is highly valued in racing and high-performance applications because the driver controls the shift timing. The transmission shifts when the driver commands the change, making it suitable for consistent drag strip performance and controlled high-power operation.

The reverse shift pattern is also important. Buyers should confirm that the shifter is compatible with the reverse-pattern layout before installation. Using the wrong shifter setup can create unsafe operation or incorrect gear selection.

For racers and performance builders, the combination of full manual valve body, reverse shift pattern, and trans-brake makes this transmission a focused choice for competitive use.

Trans-Brake and Racing Performance

This FTI Performance TH400 Level 4 transmission includes a trans-brake, which is a key racing feature. A trans-brake is commonly used in drag racing to help hold the vehicle at the starting line and support harder, more consistent launches when used with the proper setup.

The transmission is designed for racers who need quick response, strong internal construction, and repeatable performance. The 900 horsepower advertised rating makes it suitable for properly matched high-output combinations.

FTI describes the Level 4 TH400 as a strong choice for weekend bracket racers, high-powered street cars, and mud trucks. These applications require durability under load, strong shifts, and internal components capable of handling demanding power delivery.

Because a trans-brake-equipped transmission is a serious performance component, buyers should ensure the rest of the drivetrain is properly matched, including the torque converter, flexplate, driveshaft, rear end, cooling system, shifter, and safety equipment.

Heavy-Duty Internal Build Features

The FTI TH400-4S Level 4 transmission includes several upgraded internal features designed for performance use.

The listed build includes a 34-element intermediate sprag, performance clutches and steels, high-flow pump, race-prepped stock case, billet forward clutch hub, heavy-duty intermediate retainer, and a 4-clutch intermediate pack.

These components help support the transmission’s performance intent. The billet steel clutch hub adds strength where high load and repeated hard shifts can stress internal parts. The hardened steel input shaft is another important durability feature for performance builds.

The deep aluminum pan helps increase fluid capacity and supports better heat management than a basic shallow pan. Heat control is especially important in high-performance automatic transmissions because excess heat can shorten transmission life.

Some models in this transmission family may be compatible with Ultra Bell bellhousings, but buyers should verify specific compatibility before ordering or modifying the transmission.

Case, Pan, and Safety Rating Details

The FTI Performance TH400 Level 4 TH400-4S uses an OEM-style aluminum transmission case with a black finish. The case is race-prepped according to the product line description, giving builders a familiar TH400-style platform with performance preparation.

The transmission pan is listed as deep, made from aluminum, and finished in natural. A deep pan can support increased fluid capacity, which can be valuable in racing and high-load applications.

The transmission has a case fluid fill location and does not include transmission fluid. Buyers should confirm the correct fluid type, fill procedure, and break-in recommendations before operation.

This unit is listed with SFI 4.1 / 30.1 rating. It does not include a built-in transmission shield or built-in flexplate shield, so buyers should confirm safety equipment requirements for their vehicle, racing class, and sanctioning body.

Included and Not Included Components

This FTI TH400 Level 4 transmission is sold as a transmission assembly only. It includes the remanufactured transmission with the listed internal upgrades, full manual valve body, trans-brake, deep aluminum pan, 30-spline hardened steel input shaft, and Chevy-pattern configuration.

The transmission does not include a torque converter, flexplate, transmission controller, wiring harness, transmission cooler, transmission fluid, or dipstick.

Because this is a performance transmission, the supporting parts are not optional details. The correct torque converter, cooler, shifter, fluid, driveshaft yoke, flexplate, and installation hardware should be selected carefully based on the vehicle’s engine output, gearing, vehicle weight, intended use, and racing requirements.

Planning the complete installation package before purchase can help avoid delays and mismatched components.

Key Benefits for Racers and Performance Builders

The FTI Performance TH400 Level 4 Transmissions TH400-4S gives builders a strong transmission option for demanding Chevy-pattern performance applications.

The 900 HP advertised rating provides confidence for properly matched high-power combinations. The full manual valve body and reverse shift pattern give drivers direct control over gear changes, while the included trans-brake supports drag racing launch performance.

The internal build features are also important. The 34-element intermediate sprag, performance clutches and steels, high-flow pump, billet forward clutch hub, heavy-duty intermediate retainer, 4-clutch intermediate pack, and hardened steel input shaft make this a serious upgrade over a basic automatic transmission.

For drag racers, bracket racers, mud truck builders, and high-powered street car owners, this transmission offers strength, control, and track-focused performance in a familiar TH400 platform.

Who This Transmission Is Best For

This transmission is best for drag racers, weekend bracket racers, high-powered street car builders, mud truck owners, race shops, Chevrolet drivetrain specialists, and professional installers who need a FTI TH400 Level 4 transmission with serious performance capability.

It is suitable for compatible builds requiring a Chevy bellhousing bolt pattern, 3-speed automatic transmission, full manual valve body, reverse shift pattern, trans-brake, 900 HP advertised rating, 30-spline hardened steel input shaft, and deep aluminum pan.

This product is a strong choice when the existing transmission is slipping, shifting inconsistently, overheating, failing under power, or no longer suitable for the vehicle’s horsepower level.

This transmission is not intended for buyers needing a standard automatic shift pattern, lockup compatibility, included torque converter, included flexplate, included transmission cooler, included fluid, included dipstick, or street-only driving behavior unless the full manual reverse-pattern setup is appropriate for the build.

Technical Details and Included Specifications

The FTI Performance TH400 Level 4 Transmissions TH400-4S is a remanufactured 3-speed automatic transmission built for high-powered Chevy-pattern applications. It is designed around a full manual valve body, reverse shift pattern, and included trans-brake.

Fitment Support and Ordering Notes

Before ordering the FTI Performance TH400 Level 4 TH400-4S transmission, buyers should confirm that it matches the vehicle, drivetrain, and racing requirements. Important details include Chevy bellhousing bolt pattern, tailshaft and yoke compatibility, converter selection, flexplate compatibility, shifter compatibility, reverse-pattern operation, trans-brake wiring, cooler line routing, crossmember location, driveshaft length, fluid requirements, and safety equipment needs.

This transmission includes a trans-brake and uses a full manual valve body with a reverse shift pattern, so it should be installed and operated by users familiar with performance automatic transmissions.

Because the torque converter, flexplate, transmission cooler, fluid, and dipstick are not included, buyers should plan a complete installation package before starting the swap.

Customers can also compare this product with compatible TH400 torque converters, flexplates, transmission coolers, race shifters, slip yokes, transmission fluid, SFI shields, transmission mounts, cooler lines, and installation hardware when planning a complete drivetrain build.

Frequently Asked Questions

What is the FTI TH400-4S transmission?

The FTI TH400-4S is a remanufactured TH400 Level 4 automatic transmission with a Chevy bellhousing bolt pattern, full manual valve body, reverse shift pattern, included trans-brake, and 900 HP advertised rating.

Does this transmission include a trans-brake?

Yes. The FTI Performance TH400 Level 4 TH400-4S includes a trans-brake, making it suitable for properly prepared drag racing and high-performance launch applications.

Is the FTI TH400-4S fully automatic?

No. This transmission uses a full manual valve body, meaning the driver manually controls gear changes. It is not intended to operate like a normal fully automatic street transmission.

Does this transmission include a torque converter?

No. The torque converter is not included. Buyers must select a compatible converter separately based on engine power, vehicle weight, gearing, stall speed needs, and intended use.

What horsepower is this transmission rated for?

This transmission has a 900 horsepower advertised rating. The full drivetrain should still be matched properly, including converter, cooler, driveshaft, rear end, and safety equipment.

What internal performance parts are included?

The FTI Level 4 TH400 build includes features such as a 34-element intermediate sprag, performance clutches and steels, high-flow pump, billet forward clutch hub, heavy-duty intermediate retainer, and 4-clutch intermediate pack.

Does this transmission include fluid or a dipstick?

No. Transmission fluid and dipstick are not included. Buyers should source the correct fluid, dipstick, cooler, and installation parts separately.