TH400 Competition Trans. W/4in Tail Shaft

The COAN TH400 Competition Transmission with 4-inch Tail Shaft is a purpose-built automatic transmission engineered for drag racing, street performance, and high-output engine platforms. This heavy-duty unit delivers the shift consistency and load capacity demanded by competition drivers who require absolute reliability under extreme torque loads and repeated launch cycles.

Built on the proven TH400 platform, this transmission features a manual valve body and reverse pattern configuration, giving tuners precise control over shift points, line pressure, and engagement timing. The 4-inch tail shaft accommodates a wide range of driveline configurations and allows integration with custom transmission tunnels common in dedicated race vehicles. At 156 pounds, the unit's substantial weight reflects its internal reinforcement—upgraded clutch drums, strengthened internals, and competition-grade components built to sustain repeated full-throttle shifts without failure or slippage.

This transmission is designed for serious builders: dirt track racers, bracket racers, and street performance enthusiasts running big-block or small-block engines with substantial horsepower and torque output. The manual valve body allows adjustment without external tuning modules, making it ideal for applications where simplicity and mechanical control take priority. The TH400 platform is also well-suited to vintage hot rods, muscle cars, and classic restorations where builders want modern reliability without sacrificing authenticity or introducing electronic complexity.

The TH400 remains the industry standard for competition automatic transmissions due to its direct mechanical simplicity, proven durability across decades of racing history, and the vast ecosystem of performance components and tuning knowledge available. COAN's competition-grade version elevates this platform with internal upgrades and precision manufacturing, positioning it as a core component in any serious engine build targeting consistent 60-foot times and repeatable quarter-mile performance.