TH350/PG Tail Shaft Seal Turbo 350 Trans Rear Sea

The Sealed Power TH350/PG Tail Shaft Seal for Turbo 350 transmissions is a precision-engineered rear seal designed to prevent fluid leakage at the output shaft housing. Built from durable nitrile material, this seal accommodates a 2.381-inch outer diameter with a 1.500-inch shaft contact surface and maintains a 0.470-inch sealing width. As a direct replacement component, it addresses the critical junction where the transmission output shaft meets the tailhousing—a high-wear area subject to continuous rotation and pressure cycling.

Transmission fluid seepage at the tailhousing is a common failure point in aging or heavily used Turbo 350 installations. Nitrile elastomer seals maintain elasticity across a wide temperature range and resist degradation from synthetic and conventional transmission fluids, making them the industry standard for automotive drivetrain applications. The 0.470-inch width provides adequate contact pressure against the shaft surface without excessive drag, a balance critical for maintaining parasitic loss within acceptable limits. Proper fitment requires correct installation depth; the seal lip must face the fluid side of the housing with sufficient compression to prevent bypass while avoiding pinching, which would accelerate wear.

This seal is essential for owners maintaining original or restored Turbo 350 transmissions, whether in street vehicles, light-duty trucks, or performance applications where transmission cooler lines and external filter systems amplify the consequences of fluid loss. A failed tailhousing seal typically first manifests as fluid spotting beneath the vehicle and accelerated fluid level drop between service intervals. Sealed Power is an OEM-tier supplier established across automotive bearing and seal applications, positioning this component as a reliable replacement that meets original fitment standards.