Craig, when you pull the vibration damper, you may find a worn groove in it which allows oil to seep past the seal in the timing chain cover. This can be repaired with a "speedy sleeve" which is glued to the damper. Also plan on a new gasket for the cover, at the minimum. There is a "small parts gasket set" which has all this except the "speedy sleeve."
Good luck, had to leave my trucks behind while working out of town again. :p
