Was think about doing a fluid change as well. will you go ford fluid or something third party? Going to guess Ford is charging a rediculous price to change manual fluid like other shops. It's easier to change then motor oil and they usually want over $100 and you use probably 1liter of fluid.I heard back from the dealer this weekend, the cold clutch-out marbles/rattling sound is "gear rollover", and they say it's totally normal. The OP's noise ended up being something different. I'm about to do a trans fluid change as soon as they fix my leaks, and I'll report back if it quiets it down. The fluid is practically liquid gold.