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Rust between flex plate and transmission?

MB2001Idaho

New member
I just pulled my PCM 40 transmission to rebuild it and there is a fair amount of rust between the flex plate and the transmission. Is this normal?
 
No rust is good in any circumstance. Derust, treat, prime, paint, reassemble. When they put these things together sometimes they cut a few corners (shocking, I know) so things like the back of the engine block, the flywheel, and the flex coupler were let go with virtually raw iron and steel and no finish. Naturally, rust followed. Functionally it won't really hurt anything to just leave it, but for me it's a really bothersome thing to have all that rust.
 
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