what year oil pan? if its the older ones with the 3 holes in the rear U section they are known to leak there due to the rubber U seal, it can roll or get squished out of place & cause a leak that will look like a rear main leak. inspect that area real good after wiping it dry with a good solvent or brake cleaner. it could be leaking anywhere in the U area & where the ends meet the side rail gaskets.
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