Sounds like a waste disposal crushing up metal
Rotating equipment making noises that sound like a waste disposal crushing up metal is a bad sign. It does not matter if it is a car or a paper machine. I would try to get it to a MB independent to take a look at it and advise UNLESS you have a very extensive diy'er type of background. If the latter is the case I would recommend getting underneath and looking around before I pulled the engine/tranny.
Wonder what kind of car it is