I'm getting something similar in 4-3 downshifts, though today I got it in a 5-4 downshift. Before I checked out this thread, I would've described it as a sort of "scraping" sound, though "jar of marbles" sounds close. Maybe that's the transmission's way of telling me that I'm cutting it close on the clutch pedal release. I'm at 5500 miles now (yes, since June 1st; I guess I'm driving a bit too much).
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