Tailshaft Seal TH350/PG/Bert/Brinn 10pk

The Tailshaft Seal TH350/PG/Bert/Brinn 10pk from ALLSTAR PERFORMANCE is an essential maintenance component for hot rodders, drag racers, and street machine builders who rely on classic and modern manual or automatic transmissions. Whether you're running a TH350 automatic, Powerglide, Bert, or Brinn transmission in your project vehicle, tailshaft seals prevent fluid leakage at the output shaft—a critical point of failure that can compromise drivetrain performance and create messy shop floors. This 10-pack bulk offering makes it economical for shops, race teams, and dedicated enthusiasts who service multiple vehicles or maintain backup inventory for competition.

Each seal in this set features a proven rubber-and-steel construction that creates a secure dynamic barrier between transmission fluid and the external environment. The steel backing ring provides structural rigidity to resist centrifugal forces and pressure spikes, while the elastomer lip sealing surface maintains contact with the spinning tailshaft under all driving conditions—city cruising, highway touring, or full-throttle acceleration. This dual-material design has become the industry standard for transmissions operating across a wide RPM range, ensuring consistent performance whether you're spinning at idle or at redline. The compact packaging (4.75 x 3 x 5.2 inches) fits easily in your toolbox or inventory shelf, and the modest weight makes bulk storage practical.

Transmission builders, engine shops, and weekend mechanics benefit most from stocking a 10-pack, as tailshaft seal replacement is a routine service during transmission rebuilds, fluid leaks, or preventive maintenance on high-mileage builds. Installation is straightforward—the seal simply presses into the tailshaft housing bore—but proper fit and orientation are critical to prevent leaks that would otherwise necessitate another teardown. Compatibility spans popular vintage and modern transmission families: TH350 Turbo 350 automatics, Powerglide two-speeds, Bert and Brinn competition-grade units, Saginaw, and Muncie manuals, making this a versatile solution for Chevrolet, Pontiac, Oldsmobile, and Buick platforms. Having multiple seals on hand eliminates downtime waiting for parts and ensures your next rebuild or repair stays on schedule.