I am considering selling my 1997 80 Series. It is a 40th anniversary model in Desert Sage. It currently has 273,000 miles. I’ll be upgrading to something with more modern conveniences. Here’s my question - the 80 series has a few issues. Should I repair the rear main seal before I sell it? Current estimate is about $1800 from my mechanic. Additionally, the birfield joints could use some love. Is there a market for trucks that need these kinds of repairs, and what should I expect to get for it here in No. California?