Front Input Seal

The Brinn Transmission front input seal (MPN 71011) is a precision-engineered transmission input shaft seal designed for high-performance and custom transmissions. As a critical component in any manual or automatic transmission system, this seal prevents fluid leakage at the input shaft while maintaining internal pressure integrity. Whether you're building a race car, restoring a classic vehicle, or maintaining a high-performance drivetrain, a quality front input seal is essential to prevent costly transmission fluid loss and internal contamination.

Constructed with a rubber and steel composite design, the front input seal combines elastomeric sealing material bonded to a steel reinforcement ring for maximum durability and load capacity. This hybrid construction resists thermal cycling, engine vibration, and the shearing forces encountered during aggressive acceleration or sustained high-rpm operation. The steel backing provides structural rigidity while the rubber compound maintains a dynamic seal against the rotating input shaft, effectively stopping transmission fluid seepage at a critical wear point. Weighing just 0.06 lbs and measuring 2.95 x 0.4 x 5.25 inches, the compact design fits within tight transmission bell housing tolerances without requiring modifications.

Mechanics and transmission specialists rely on Brinn Transmission seals for custom builds, racing applications, and heavy-duty installations where OEM components fall short. Installation requires removal of the transmission input shaft or complete transmission disassembly, depending on your vehicle's design. This seal is ideal for street machines, drag racing vehicles, off-road trucks, and any platform running a Brinn or similar performance transmission. Proper installation with transmission fluid on the seal lips ensures immediate effectiveness and extends component life significantly compared to worn or undersized alternatives.