Perm-Align Trans. Gasket - GM TH350

The Perm-Align Trans. Gasket for GM TH350 is a critical sealing component designed for transmission pan installation on classic and modern vehicles equipped with Turbo Hydra-Matic 350 transmissions. This gasket is engineered for mechanics and enthusiasts performing transmission maintenance, fluid changes, or rebuild work who require a reliable, leak-free seal. As any experienced technician knows, a compromised transmission pan gasket leads to fluid leakage, overheating, and potential transmission damage—making OEM-quality gasket selection non-negotiable.

Constructed from a durable rubber and steel composite, this gasket features a 3/16-inch thickness that provides structural support and conformability to pan mounting surfaces without excessive compression. The Perm-Align design ensures consistent clamping force distribution across the gasket face, reducing the risk of localized pressure points that cause premature failure. The rubber-steel laminate construction resists transmission fluid degradation and maintains elasticity across the full operating temperature range of the TH350, from cold start to high-load highway conditions, while the steel reinforcement prevents extrusion under pan bolt torque.

This gasket is essential for anyone servicing a TH350-equipped vehicle—whether rebuilding a vintage muscle car, maintaining a work truck, or refreshing transmission seals on a street rod. Proper installation requires following OEM torque specifications and surface preparation guidelines; clean all old gasket material and fluid residue from both the pan and transmission case before installation. The gasket dimensions (14.1 x 16.8 inches) and 0.9 lb weight are optimized for standard TH350 pan fitment across Chevrolet, Pontiac, Oldsmobile, and Buick platforms from the 1960s through 1980s, and remains compatible with modern street performance builds using period-correct components.