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Im not sure what it did but the differential is now quiet and I understand that the gears are a mechanical device and not pourous like wood. I am glad it worked.

Just an update the noise is almost gone today. I think the new fluid is really working wonders. Thanks.

Thanks, I had the differential fluid level checked and it was full. The service tech said it was very dirty and thick. I had it changed and the noise is getting less each day. I was told that the new Valvoline gear oil does not need additives and has conditioning agents in it and that it may...

I am getting a loud humming noise coming from the undercarriage when driving with my foot lightly pressing on the gas pedal just enough to maintain speed at around 35 mph.and up. It stops when I coast and it stops when I press on the gas hard. It does not happen in park or neutral. I have been...