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The parameters of a good usable core gearbox are pretty well defined. It is expected to have a good ring and pinion and differential. The majority of the gears are expected to be good and the cases aren’t cracked.
Bearings, seals, synchros, shift forks, and the like may need replacement.
If you buy a core, and all the gears are rusty (water should never get inside a gearbox!!!) you have every right to be pissed. And this why my first response said show me the pictures.
The gearbox should be rebuildable. That’s what a core is.
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