TH400 Level-4 Trans 900HP w/Chev Ultra Bell

The TH400 Level-4 Trans 900HP w/Chev Ultra Bell is a purpose-built competition and high-performance automatic transmission designed for serious automotive enthusiasts who demand reliability at extreme horsepower levels. This transmission represents the pinnacle of FTI PERFORMANCE's engineering, engineered for vehicles producing 900 horsepower and beyond. Whether you're building a street strip warrior, dedicated drag racer, or high-output engine platform, this Level-4 unit delivers the shift quality, durability, and holding capacity required when standard factory components fall short.

The Level-4 specification indicates FTI PERFORMANCE's highest internal upgrade package, featuring reinforced internal components, enhanced clutch materials, and optimized band apply pressures to handle extreme power transfer without slippage or failure. The Chevrolet Ultra Bell housing ensures seamless integration with LS and Gen V small-block platforms, eliminating costly adapter complications and allowing direct engine-to-transmission coupling. This configuration delivers crisp, consistent shift quality while the robust internal construction withstands repeated shock-loads inherent to drag racing, street racing, and dyno pulls that would compromise lesser transmissions.

This transmission is ideal for Chevrolet small-block powered vehicles, LS swaps, and custom engine builds targeting 900+ horsepower output. Installation requires proper supporting modifications including reinforced driveline components, torque converter selection matched to engine characteristics, and transmission cooler capacity adequate for sustained high-load operation. Serious builders, race teams, and dedicated performance shops choose the TH400 Level-4 when cost-of-failure is unacceptable and transmission reliability directly impacts competition results or vehicle investment.