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How does your gear shift feel when you try to put it in reverse? Stiff and doesn't go in at all? Or no resistance when even moving it? I'm assuming it doesn't move in gear at all. The 5th and reverse gear are engaged using the same shift fork shaft so if you can still shift into 5th its probably not a broken shift fork.
It definitely sounds like something with your reverse gear or something near it has broken off. That vibration is probably your gears grinding on that broken piece.
I'm thinking the transmission probably had low fluid for awhile and one of the parts finally overheated and broke off causing the issue. The manual trans is a pretty simple machine, just a bunch of spinning gears on a shaft that's submerged in a box full of fluid to reduce wear and heat.
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