Re: How loud is too loud for gears?
For a first-step, I would recommend getting some true 600-weight gear oil, from someplace like Snyders, Brattons, or Bert's, driving the car around the neighborhood for 15 minutes or so ( going through the gears ) to warm the oil up, then draining whatever is in there now ( overnight, if you can), then re-filling with the 600-weight.
The original type heavy gear oil DOES make a difference in how the transmission shifts ( less clashing of gears ). It won't do much to silence worn bearings, but might quiet worn gears for a while.
I wouldn't worry too much about your tranny "grenading"... I've driven my A for 4 years / 8,000 miles with a growly transmission...
I would like it to be quiet, but at least it hasn't exploded or locked-up.
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