The PORC Off Road Products output shaft seal is designed as a direct replacement for 1945–1979 Willys and Jeep CJ models equipped with Dana 18 transfer cases. This seal installs at the transfer case output shaft location and integrates with factory components for proper fitment. Manufactured to match original specifications, it is designed for consistent installation within the transfer case assembly. The design allows for straightforward replacement during maintenance or service. Ideal for replacing worn or aged components, this seal restores proper fitment within the transfer case output assembly. Replaces OE Part Number 8123077, Interchange part number 18670.04.