rear main seal replacement 73 Dart 318 V8

I'm glad you found the real problem, and that it was an easier fix. While we are on the subject, I haven't had much luck stopping oil leaks by replacing just the rear main seal. It has been my experience that there is usually a bit of a groove worn into the crank by the seal itself. Just replacing the seal might not totally fix the problem. Some oil still seems to seep past the new seal and the groove. I have been told that oversize seals were available for just this problem, but I have never been able to find them.