Seriously? Scrape off the rust and paint it with POR 15. Rust on the housing has dick all to do with what it's like inside. Find another shop pronto.They told me it was so rusty that they would need to rebuild the entire axle. It really isnt that rusty, I didn't get a good feeling about the shop after them telling me all of this. Then they told me I overpaid for the 80 series (12k plus tax and title). I already ordered the Valve Cover Gasket and it looks really easy to fix.