My B3's were always super silent after years of abuse!
My current B4 and my old one (now sold over a year ago) are both still silent.
Normally when i hear a bad sounding gearbox it's got grit in it. If it has grit and has been munching itself it might have damaged the gears causing the noise.
If you spend time cleaning all the gears, casing and lubing them before resealing the case it will last a long time, way past when the diff needs rebuliding.
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