TH400-3UB Level 3 Automatic Transmission

The FTI Performance TH400-3UB represents a Level 3 automatic transmission, engineered for demanding street and track performance. This unit is specifically designed to handle up to 800 horsepower, making it a robust choice for enhanced vehicle power. Key components include a GM Ultrabell for compatibility, a full manual valve body for precise control, and performance red clutch and steels to ensure reliable engagement under high-load conditions. The transmission also features a deep aluminum pan, which aids in heat dissipation and contributes to overall longevity. With a 2.43 first gear ratio and a 3-speed configuration, this TH400 transmission is built for aggressive acceleration. It utilizes a Chevy bellhousing bolt pattern and a 4.063-inch tailshaft length. It is designed with a forward shift pattern for intuitive driver operation. Note that this transmission is rated for 800 HP, with some sources indicating other levels can handle up to 1100 HP.