280mm Pro Street Torque Converter GM TH350/TH400

The 280mm Pro Street Torque Converter for GM TH350/TH400 is engineered for street and strip applications where consistent power delivery and reliable engagement are non-negotiable. Built by COAN, a name trusted in high-performance transmission components, this converter bridges the gap between stock efficiency and full-race capability. Whether you're upgrading a classic Chevrolet muscle car, a street rod, or a modern restomod, this torque converter addresses the fundamental mismatch between engine RPM and transmission input speed that limits acceleration and cruising comfort.

At 280mm diameter, this Pro Street converter balances stall speed and efficiency for engines ranging from mild street builds to moderate performance applications. The converter's internals are designed to reduce slippage during acceleration while maintaining smooth lockup characteristics on the highway—critical for fuel economy and heat management in daily-driven vehicles. COAN's manufacturing process ensures precise blade geometry and dynamic balancing, minimizing vibration and extending transmission life. The 34-pound assembly integrates seamlessly with TH350 and TH400 transmissions, the most popular and rebuildable General Motors automatics in the enthusiast community.

Pro Street converters like this one are ideal for street-driven vehicles where drivability matters as much as performance. If you're building a Chevelle, C10, Nova, or other classic GM platform with a small-block or big-block engine, this converter will improve throttle response and reduce transmission lag without compromising part-throttle cruising. Installation requires transmission removal and bench work; compatibility is confirmed with both TH350 and TH400 applications. Proper transmission fluid, cooler upgrade, and a skilled technician ensure optimal performance and longevity in your build.