833 4spd repair advice

I can tell you what happened, you F’ed it all up!
With clutch out the input shaft spins at engine RPM and all the gears are in constant mesh so every bearing and gear tooth is moving and running on something with zero oil.

Not the thing to do to any trans, let alone a rebuilt one.

sorry you didn’t know what your were doing, let’s hope others read this and learn not to do this.

and don’t shift it with the engine off, that’s not doing it any Favours either.