based on the information I have my guess is at minimum you lost the rear main seal.
Fun!
That one isn't too bad actually maybe an hour labor for a good mechanic on most trucks. if its the seal, worst case its a 20$ seal. Sorry I can't help you out more I wish I could.
I appreciate the input. I know the ballpark for worst-case, and I'm prepared for it. Any news in the other direction makes it better.
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