Until you know for sure what the problem is, it's hard to try to tell you exactly how to fix it. If the original seal wore a groove into the crankshaft journal, and a replacement seal was installed that rides in that same groove, then it's a given that it would continue to leak. The replacement seal would either need to be of the offset type so it's lip would contact a virgin part of the crank journal, or the crank would have needed to have a repair sleeve and the appropriate replacement seal installed.
Originally Posted by ayrobotech
One way or the other, somebody is going to have to take a look at that rear main seal and figure out exactly what is going on. I do NOT envy the job you have ahead of you.
2000 Plymouth Voyager - Original 2.4L and 31TH - 210,000 miles
1997 Dodge Caravan Sport - Original 3.3L and 41TE - 113,000 miles