TH400 Master O/Haul Kit

The TH400 Master O/Haul Kit by COAN is the go-to solution for anyone planning a complete overhaul of a Turbo 400 automatic transmission. Whether you're rebuilding a high-performance hot rod, restoring a classic muscle car, or upgrading a truck for enhanced durability, this comprehensive kit ensures every critical component is replaced with quality materials during your transmission refresh. Transmission rebuilds demand precision and completeness—skimping on parts leads to premature failure and costly repeat teardowns that sideline your vehicle indefinitely.

This master overhaul kit includes all necessary seals, gaskets, friction materials, and hard parts engineered to OEM specifications for the legendary TH400 transmission platform. COAN manufactures each component to tight tolerances, ensuring proper fit and long-term reliability under both street and performance driving conditions. The kit's design accounts for wear patterns and material degradation that occur during transmission operation, providing a complete renewal of internal surfaces and sealing systems. By consolidating all required parts into a single kit, builders eliminate guesswork and reduce the risk of missing critical components that could compromise shift quality or cause leaks.

Professional mechanics, transmission shops, and serious DIY enthusiasts rely on this kit for rebuilding TH400 units destined for street cars, race vehicles, and heavy-duty applications. The comprehensive nature of the master kit makes it ideal for situations where transmission internals show signs of wear, slippage, or contamination, or when building a transmission from a core case requiring complete renewal. Proper installation requires a torque wrench, gasket scraper, and mechanical knowledge of transmission assembly sequences—consultation with a service manual or experienced rebuild technician is strongly recommended before disassembly begins.