We're cleaning up a Datsun tranny right now for a customer that has a Swiftune 1380 to mate to it, that we also checked out for him. The tranny even after cleaning is stained and discolored, so we removed any steel bits bolted on it, and will bead blast and repaint them and then use Duplicolor hi heat cast aluminum to paint the tranny case, this stuff looks jsut like fresh cast aluminum, and is extremely duarable.