Description
Product Overview
The FTI Performance TH400 Level 4 Transmissions TH400-4UB is a race-focused automatic transmission built for serious performance use. As part of the FTI Performance TH400 Level 4 Transmissions line, this unit is designed for compatible Chevy drag racing applications where controlled launches, strong internal components, firm manual shifting, and dependable high-output performance matter.
This transmission is identified by Manufacturer’s Part Number TH400-4UB, Summit Racing Part Number FTI-TH400-4UB, and UPC 887753825643. These identifiers help drag racers, weekend bracket racers, high-powered street car builders, mud truck builders, race teams, performance shops, transmission installers, mechanics, and drivetrain specialists confirm the correct FTI TH400 Level 4 transmission before ordering.
The transmission features a 3-speed configuration, Chevy bellhousing bolt pattern, reverse shift pattern, and full manual valve body. This setup is built for racing applications where the driver controls each gear change and needs precise, immediate shifting behavior.
The included trans-brake is a major race-focused feature. FTI TH400 Level 4 transmissions are built with a full manual valve body equipped with a transbrake, making them a strong fit for drag racing and other high-performance launch applications when properly wired and configured.
The transmission is rated at 900 advertised horsepower, giving it strong appeal for properly matched race cars, high-powered street cars, weekend bracket cars, and mud trucks.
The notes confirm that this model features an Ultra Bell bellhousing, an important fitment and strength-focused detail for buyers confirming their engine and chassis setup.
This transmission uses a deep natural aluminum pan, 4.063-inch tailshaft, slip-on yoke style, 30-spline input, hardened steel TH350/400-style input shaft, 2.43 first gear ratio, billet steel clutch hub, OEM-style black aluminum case, and case-fill location.
The FTI TH400 Level 4 line also includes strong race-focused features such as 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 4-clutch intermediate pack.
The torque converter is not included, the flexplate is not included, the transmission controller is not included, the wiring harness is not included, the transmission cooler is not included, transmission fluid is not included, and the dipstick is not included, so buyers should plan all supporting components before installation.
Fitment and Application Details
The FTI Performance TH400-4UB Level 4 transmission should be matched carefully to the intended Chevy racing or high-performance application before ordering. TH400 transmission fitment can vary by engine platform, bellhousing setup, converter requirements, flexplate compatibility, input shaft style, tailshaft length, yoke style, transmission mount location, crossmember position, driveshaft length, shifter compatibility, cooler routing, fluid fill location, trans-brake wiring, and safety requirements.
Important fitment details to verify include vehicle year, make, model, engine platform, Chevy bellhousing bolt pattern, Ultra Bell bellhousing compatibility, TH400 platform compatibility, torque converter requirements, flexplate compatibility, converter bolt pattern, crankshaft pilot fitment, 30-spline hardened steel TH350/400-style input shaft compatibility, 4.063-inch tailshaft fitment, slip-on yoke compatibility, transmission mount location, crossmember position, driveshaft length, shifter compatibility, reverse shift pattern, full manual valve body operation, trans-brake wiring, launch-control setup, cooler line routing, transmission cooler requirements, fluid specifications, dipstick setup, SFI 4.1/30.1 compliance needs, and application-specific hardware.
Because the torque converter is not included, converter selection is critical. Buyers should choose the correct converter based on engine output, torque curve, camshaft, vehicle weight, rear gear, tire size, launch rpm, mud truck use, street/strip behavior, and racing class.
Because the flexplate is not included, buyers should confirm the correct flexplate for the engine, crankshaft, converter bolt pattern, balance requirement, and starter setup.
Because the trans-brake is included, buyers should confirm activation method, wiring, shifter compatibility, staging setup, electrical readiness, and racing rules before installation.
Because the transmission includes an Ultra Bell bellhousing, buyers should verify engine fitment, bellhousing clearance, starter alignment, converter spacing, chassis clearance, and installation hardware.
For a complete installation, additional components may be required, including a torque converter, flexplate, transmission cooler, cooler lines, transmission fluid, dipstick, shifter, shifter cable, trans-brake wiring, transmission mount, crossmember hardware, driveshaft/yoke components, safety equipment, and vehicle-specific installation parts.
Build Quality and Reliability
The FTI Performance TH400 Level 4 Transmissions TH400-4UB is built for buyers who need a strong TH400 transmission for drag racing, weekend bracket racing, high-powered street cars, and mud trucks. The Level 4 line is designed around race-focused internal upgrades and controlled launch performance.
The full manual valve body gives the driver direct control over shifts, while the included trans-brake supports consistent launch control in properly configured racing applications.
The 900 advertised horsepower rating gives this unit strong performance credibility for serious builds when properly matched to the vehicle and supporting parts.
FTI TH400 Level 4 transmissions feature 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 4-clutch intermediate pack.
The listed hardened steel input shaft, billet steel clutch hub, and Ultra Bell bellhousing add important strength-focused value.
The SFI 4.1/30.1 rating provides an important competition safety specification for buyers building race vehicles that must comply with class or sanctioning-body requirements.
Because this is a serious performance transmission, correct installation and supporting components are essential. Buyers should confirm converter selection, cooling capacity, flexplate compatibility, shifter setup, trans-brake wiring, fluid requirements, driveline length, yoke compatibility, and race safety requirements before use.
What Makes This Transmission a Strong Choice
The FTI Performance TH400-4UB Level 4 transmission is a strong choice for buyers who need a compatible Chevy TH400 racing transmission with a full manual valve body and trans-brake.
The 900 advertised horsepower rating supports serious performance applications.
The Ultra Bell bellhousing is a valuable confirmed feature for compatible race builds.
The full manual valve body gives racers direct shift control.
The included trans-brake supports controlled launch performance when properly wired and configured.
The hardened steel TH350/400-style input shaft and billet steel clutch hub add important drivetrain-strength details.
The 2.43 first gear ratio helps builders plan converter behavior, rear gear selection, tire size, and launch strategy.
The deep aluminum pan, high-flow pump, performance clutches and steels, and 34-element intermediate sprag support the Level 4 performance identity.
The exact TH400-4UB manufacturer part number, FTI-TH400-4UB Summit Racing part number, and UPC 887753825643 support accurate product identification before ordering.
Ideal Buyers and Use Cases
The FTI Performance TH400 Level 4 Transmissions TH400-4UB is ideal for drag racers, weekend bracket racers, mud truck builders, high-powered street car owners, race teams, chassis builders, performance shops, engine builders, race-prep garages, transmission installers, service departments, and drivetrain specialists who need a compatible TH400 Level 4 racing transmission.
It is suitable for compatible Chevy applications requiring a 3-speed TH400 automatic transmission, reverse shift pattern, full manual valve body, trans-brake, 900 horsepower rating, Ultra Bell bellhousing, hardened steel input shaft, billet steel clutch hub, deep aluminum pan, and SFI 4.1/30.1 rating.
This product is useful for drag cars, bracket racing vehicles, high-powered street/strip builds, mud trucks, purpose-built race cars, and serious performance drivetrain projects.
It is also a practical choice for professional builders confirming supporting components such as the torque converter, flexplate, transmission cooler, cooler lines, transmission fluid, dipstick, shifter, trans-brake wiring, mount, crossmember, driveshaft/yoke setup, and safety equipment.
The best buyer for this transmission is someone who can confirm the Chevy engine fitment, TH400 platform requirements, converter setup, flexplate compatibility, Ultra Bell bellhousing fitment, 4.063-inch tailshaft, slip-on yoke, trans-brake wiring, cooling system, and SFI requirements before ordering.
Technical Specifications
| Specification | Details |
|---|---|
| Product Name | FTI Performance TH400 Level 4 Transmissions TH400-4UB |
| Brand | FTI Performance |
| Manufacturer’s Part Number | TH400-4UB |
| Part Type | Automatic Transmissions |
| Product Line | FTI Performance TH400 Level 4 Transmissions |
| Summit Racing Part Number | FTI-TH400-4UB |
| UPC | 887753825643 |
| Number of Gears | 3 |
| Transmission Platform | TH400 |
| Bellhousing Bolt Pattern Manufacturer | Chevy |
| Bellhousing Detail | Ultra Bell bellhousing |
| Transmission Shift Pattern | Reverse |
| Valve Body Style | Full manual |
| Transmission Advertised Horsepower Rating | 900 |
| Torque Converter Included | No |
| Flexplate Included | No |
| Transmission Controller Included | No |
| Wiring Harness Included | No |
| Transmission Cooler Included | No |
| Trans-Brake Included | Yes |
| Lockup Compatible | No |
| Transmission Pan Style | Deep |
| Transmission Pan Material | Aluminum |
| Transmission Pan Finish | Natural |
| Tailshaft Length | 4.063 in. |
| Yoke Style | Slip-on |
| Input Spline Quantity | 30 |
| Input Shaft Material | Hardened steel |
| Input Shaft Style | TH350/400 |
| First Gear Ratio | 2.43 |
| Clutch Hub | Billet steel |
| Transmission Case Style | OEM |
| Transmission Case Material | Aluminum |
| Transmission Case Finish | Black |
| Transmission Shield Built In | No |
| Flexplate Shield Built In | No |
| Fluid Fill Location | Case |
| Transmission Fluid Included | No |
| Dipstick Included | No |
| SFI Rating | SFI 4.1/30.1 |
| Remanufactured | Yes |
| Quantity | Sold individually |
| Level 4 Features | 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, 4-clutch intermediate pack |
| Intended Use | Drag racing, weekend bracket racing, high-powered street cars, and mud trucks |
| Compatibility Support | Confirm fitment before ordering |
Ordering Support and Fitment Guidance
Before ordering the FTI Performance TH400 Level 4 Transmissions TH400-4UB, confirm that the transmission matches your Chevy application, TH400 platform requirements, converter setup, bellhousing fitment, trans-brake needs, and driveline layout.
Important details to verify include vehicle year, make, model, engine platform, Chevy bellhousing bolt pattern, Ultra Bell bellhousing compatibility, TH400 transmission compatibility, torque converter requirements, flexplate compatibility, converter bolt pattern, crankshaft pilot fitment, 30-spline hardened steel TH350/400-style input shaft compatibility, 4.063-inch tailshaft fitment, slip-on yoke setup, transmission mount location, crossmember position, driveshaft length, shifter compatibility, reverse shift pattern, full manual valve body operation, trans-brake wiring, cooler line routing, transmission cooler requirements, fluid requirements, dipstick setup, SFI 4.1/30.1 requirements, and race safety rules.
This transmission is sold individually and includes the trans-brake and Ultra Bell bellhousing. It does not include the torque converter, does not include the flexplate, does not include the transmission controller, does not include the wiring harness, does not include the transmission cooler, does not include transmission fluid, and does not include a dipstick.
Our team can help confirm compatibility using the TH400-4UB part number, Chevy engine setup, converter requirements, Ultra Bell bellhousing fitment, tailshaft length, yoke setup, shifter configuration, trans-brake needs, SFI requirements, and drivetrain layout before ordering.
Frequently Asked Questions
What is the FTI Performance TH400-4UB transmission?
The FTI Performance TH400-4UB is a TH400 Level 4 3-speed automatic racing transmission with a Chevy bellhousing bolt pattern, reverse shift pattern, full manual valve body, included trans-brake, Ultra Bell bellhousing, and 900 advertised horsepower rating.
How many gears does this transmission have?
This transmission has 3 gears.
What horsepower rating does this transmission have?
The transmission advertised horsepower rating is 900 horsepower. Buyers should confirm suitability for the exact engine output, vehicle weight, converter, rear gear, tire size, and intended use.
Does this transmission include an Ultra Bell bellhousing?
Yes. The notes confirm that this model features an Ultra Bell bellhousing.
Does this transmission include a trans-brake?
Yes. The trans-brake is included. Buyers should confirm wiring, activation method, shifter compatibility, launch setup, and race rules before installation.
What valve body style does this transmission use?
This transmission uses a full manual valve body, which is built for driver-controlled shifting in racing and performance applications.
What shift pattern does this transmission use?
This transmission uses a reverse shift pattern.
Does this transmission include a torque converter?
No. The torque converter is not included. Buyers should select the correct converter for the engine, vehicle weight, rear gear, tire size, stall requirements, and intended racing use.
Does this transmission include a flexplate?
No. The flexplate is not included. Buyers should confirm the correct flexplate for the engine, crankshaft, converter bolt pattern, and starter setup.
Does this transmission include a cooler, fluid, or dipstick?
No. The transmission cooler is not included, transmission fluid is not included, and the dipstick is not included. Buyers should plan these components before installation.
Is this transmission lockup compatible?
No. This transmission is listed as not lockup compatible.
What is the first gear ratio?
The listed first gear ratio is 2.43.
What tailshaft length does this transmission have?
The listed tailshaft length is 4.063 inches.
What SFI rating does this transmission have?
This transmission is listed with an SFI 4.1/30.1 rating.
Is this transmission remanufactured?
Yes. This transmission is listed as remanufactured.
Who is this transmission best for?
This transmission is best for drag racers, weekend bracket racers, mud truck builders, high-powered street car owners, race teams, performance shops, transmission installers, and drivetrain specialists who need a compatible FTI TH400 Level 4 racing transmission with full manual valve body, trans-brake, Ultra Bell bellhousing, and 900 horsepower rating.
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