TH350 Master O/Haul Kit

The TH350 Master O/Haul Kit from COAN is a comprehensive automatic transmission rebuild solution designed for mechanics and performance enthusiasts tackling a complete TH350 overhaul. Whether you're restoring a classic muscle car, refreshing a daily driver, or preparing a street rod for peak performance, this master kit eliminates the guesswork of sourcing individual components by bundling everything needed for a proper restoration. The TH350 remains one of the most popular three-speed automatic transmissions ever produced, and a quality overhaul kit is essential for returning these legendary gearboxes to factory specifications or beyond.

This master overhaul kit includes precision clutches, durable steel plates, OEM-spec gaskets, and critical seals—the core wear items that determine transmission longevity and shift quality. Clutches and steels handle the torque transfer and engagement cycles; worn units cause slipping, delayed shifts, and loss of power delivery. Fresh gaskets and seals prevent fluid leaks that can starve the transmission of lubrication, leading to catastrophic internal wear. COAN's master kit approach ensures matched component sets engineered to work together, eliminating compatibility issues that arise when mixing aftermarket suppliers. Proper installation requires a complete teardown, thorough cleaning of the case, and careful reassembly—a task demanding mechanical expertise and the right tools.

Professional builders, transmission shops, and experienced home mechanics benefit most from this comprehensive kit, particularly those working on TH350 units in Chevrolet, Pontiac, Oldsmobile, and Buick platforms from the 1960s through 1980s. The kit's compact 14 x 7 x 14-inch package and 8.04-pound weight make storage and handling practical for any shop environment. Success depends on following factory torque specifications, using quality transmission fluid, and verifying all seals seat properly before reassembly. For those committed to returning a TH350 to reliable, smooth-shifting operation, this master kit provides the foundation for a transmission that will perform for decades.