Tailshaft Seal/Bushing TH350/PG/Bert/Brinn

The Tailshaft Seal/Bushing TH350/PG/Bert/Brinn (SKU ALL 72152) is an essential wear component designed for high-performance manual and automatic transmissions commonly found in drag racing, street rods, and rebuilt classic vehicles. Whether you're running a TH350 Turbo 350, Powerglide, Bert, or Brinn transmission, this seal-bushing assembly prevents fluid leakage at the output shaft while maintaining proper bushing support and alignment. Built for competitors and enthusiasts who demand reliability during high-torque launches and sustained performance driving, this part addresses a critical failure point that can lead to catastrophic transmission damage if neglected.

Constructed from precision-molded rubber bonded to steel backing, this tailshaft seal-bushing hybrid design combines dynamic sealing properties with structural support for the transmission output shaft. The rubber compound resists fluid degradation and maintains elasticity across a wide temperature range typical of engine bay and transmission tunnel environments. The steel insert provides rigidity to prevent extrusion under peak torque loads—critical when transferring 400+ horsepower through a driveline. The compact profile (4.85 x 1.05 x 6.9 inches) ensures easy installation without extensive disassembly, and the lightweight design (0.19 lbs) adds negligible mass while delivering maximum durability.

Street rodders, bracket racers, and transmission rebuilders rely on this component as part of routine rebuild kits for vintage and modified transmissions. Installation is straightforward during tailshaft housing removal—simply press out the old seal-bushing and press in the new assembly using standard hydraulic or arbor press techniques. Compatible with TH350 transmissions, Powerglide (PG) units, and aftermarket Bert or Brinn housings, this part ensures consistent performance across diverse drivetrain configurations. Recommended as preventive maintenance during any transmission overhaul to avoid repeat failures and maintain shift quality, throttle response, and driveline integrity over thousands of performance miles.