What brand of 3:73?
Ran GM 3.73's in my A4 Z28. Zero whine/noise
Currently running GM 4.10's in my M6 bird...same story
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I had Richmond gears-for about three weeks. They howled like crazy. My research afterwards (!) taught me that most aftermarket gears whine due to how they're cut. They are stronger, tho. GM gears are the quietest. JAWS has them, and they have the best pricing. GM gears are made by AAM (American Axel & Manufacturing) and will likely come in a AAM box. Same stuff.
I got AAM gears and they're nice and quiet.
GM gears cannot be had in a "thick" version so depending on your original ratio and diff unit, going to a 3.73 ratio may also require you to get a new diff.












