3rd gear synchro gone again...
The 3.70 gears in my Moser whine too, BTW. They're harder material than the stock gears, in order to be more durable, and as a side effect, they tend to whine. So yes, that's fairly normal. (I see posts every once in a while from people who claim that their steeper gears don't whine, but they seem to be few & far between.)

