I imagine it would destroy the engine and the transmission, but it’s just a guess.
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You’d prolly destroy the transmission as it would take most of the strain.
That said it may not even be possible to get it into gear. Synchros certainly wouldn’t handle it well and I’m not sure how easy it works be to rev match it.
It’s called a “money shift”, and, assuming there isn’t a gate or interlock in the transmission to stop you, you will massively over rev the engine, and destroy it.
There’s a few videos on YouTube of it happening.