ARVENO said:ok, I got it,
i've got the hub off , yes the oil is coming from the trans seal..behind the clutch hub.
Before replacing seal and o ring and putting the new clutch hub back...is there any kind of silicone/sealant should i use to be sure it won't leak again ?
No, sealant is required nor recommended. Since the front seal is leaking, do you see any scoring/pitting on the hub gear? Check the input shaft for lateral play. If you can detect play, it becomes a new game and you may need an input bearing. In other words, see if something besides age caused the seal to fail. If only age related, or hub gear surface problem then you will take care of everything with what you have.