TH400 Gasket & Seal Kit w/Teflon Rings

The FTI Performance TH400 Gasket & Seal Kit with Teflon Rings is a comprehensive overhaul gasket set engineered for the Turbo 400 transmission—one of the most durable and widely rebuilt automatic transmissions in automotive history. This kit supplies all composite gaskets and seals required for a complete transmission teardown and reassembly, making it essential for transmission builders, restoration shops, and serious enthusiasts performing a full TH400 overhaul.

A proper gasket and seal kit is the foundation of a leak-free, long-lasting transmission rebuild. The inclusion of Teflon rings in this FTI Performance package ensures reliable sealing in areas subject to high pressure and thermal cycling. Composite gasket material resists oil degradation and maintains integrity across the operating temperature range typical of street and performance applications. Quality gasket kits prevent oil weeping from pan flanges, case seams, and internal passages—issues that emerge within months of a poor rebuild but are avoided entirely with factory-specification sealing components.

Professional transmission rebuilders and DIY builders restoring street rods, muscle cars, classic trucks, and performance vehicles depend on complete gasket kits to streamline the rebuild process and eliminate repeat disassembly. Whether you're refreshing an original TH400 or upgrading a vehicle with this proven transmission platform, sourcing a verified kit ensures you have every gasket and seal specification correct on the first attempt. The TH400 Gasket & Seal Kit with Teflon Rings from FTI Performance is the standard choice for builders who prioritize reliability and correct assembly.