O-Ring Rev. Idler Shaft 3/4in OD x 5/8in ID 1/16

The O-Ring Rev. Idler Shaft 3/4in OD x 5/8in ID 1/16 by BERT TRANSMISSIONS is a precision sealing component engineered for Bert Second Generation transmission builds and high-performance racing applications. This elastomer o-ring serves as a critical seal on the reverse idler shaft, preventing fluid leakage and maintaining system pressure integrity during aggressive driving. Whether you're building a street rod, bracket racer, or street machine with a Bert transmission, this o-ring is an essential consumable for proper assembly and reliable operation.

Manufactured from durable rubber compound, this o-ring features a 3/4-inch outer diameter and 5/8-inch inner diameter with a 1/16-inch cross-section, designed to fit precisely into the grooves of the Bert transmission's reverse idler shaft assembly. The tight tolerances and material composition ensure a permanent seal under hydraulic pressure and the thermal cycling inherent in transmission operation. Proper sealing at the idler shaft prevents transmission fluid weeping, contamination, and loss of pressure—all of which compromise shift quality and accelerate internal wear on gear trains and syncros.

Technicians and builders restoring or assembling Bert Second Generation transmissions should stock this o-ring as part of their seal kit. Installation is straightforward: seat the o-ring into its groove on the reverse idler shaft before assembling the shaft into the transmission case. Replacement is recommended during any major transmission rebuild or overhaul to guarantee leak-free operation. At just 0.03 lbs, this compact component is easy to inventory and essential for any serious transmission shop or performance enthusiast working with Bert hardware.