Oil Seal Extension Housing

The TREMEC Oil Seal Extension Housing (part number TCSJ1277) is a precision-engineered replacement seal specifically designed for TREMEC TKO transmission applications. This OEM-specification component prevents fluid leakage at the transmission extension housing, maintaining proper lubrication levels and protecting internal components from contamination during high-performance driving and sustained load conditions.

The extension housing seal is a critical component that experiences constant exposure to transmission fluid and thermal cycling. A worn or failed seal allows fluid to weep past the tailshaft, leading to transmission oil loss, inadequate internal lubrication, and potential gear damage. This replacement seal restores the factory seal interface and ensures the extension housing maintains its fluid-tight seal under normal operating pressure and temperature ranges.

Builders replacing a TREMEC TKO transmission or performing transmission service will need this seal to prevent post-installation fluid loss. The part fits the standard tailshaft bore on TREMEC TKO housings and is supplied individually, allowing repair without purchasing an entire seal kit. Weighing 0.11 lbs and measuring 4.1 x 1.2 x 5.4 inches, it integrates seamlessly into existing transmission geometry without modification.