yes; chose one or both;
Test-1
Set the parking brake or block the wheels to keep the car from moving. Put the trans in neutral.
Check to make sure the TO bearing is NOT touching the clutch fingers. This is guaranteed to make the TO bearing quiet while running. You can do this by; 1) dropping the inspection cover and looking, or 2) adjusting the freeplay and if necessary pulling the TO fork towards the front of the car. If you have more than a half inch of freeplay, then you are already in business, assuming your anti-rattle spring is installed correctly. Sometimes they go missing. Then;
Start the engine. As soon as the engine starts, the entire clutch begins to turn, including the input gear and cluster gear, but NOT the TO bearing, because it is NOT touching anything, you made sure of that. This is irrespective of if the trans is in Neutral or not. If you have this noise in neutral, with the rear wheels Not turning, the only thing that can cause it is the front bearing.
To me, it sounds like the trans has no oil in it. If true, and the car was operated like this, then the trans may have been toasted.
Test-2
Check the oil level and fill it as may be necessary, then go for a roadtest. Get the car up to top gear. If the noise more or less goes away, then the diagnoses is correct.
In top gear, everything inside the trans on the mainshaft from crank to driveshaft is all spinning together at the same rpm. The cluster is going for a free ride, and there is close to zero power being pumped into it; and so the front bearing is doing little to no work other than just supporting the input gear. In this mode, the noise should be considerably quieter.
