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Discussion Starter #1 (Edited)
Car is a 2000, new Dif/tranny fluid in the last 5k miles. In 6th (and a bit in others) under power I get the wine. I have some clunking going on when letting on and off the gas, so I think I may be due for a CSB. Could that be the culprit?

M5 Whine - YouTube

Pardon the GPS on this one.

M5 Whine 2 - YouTube
 

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I have the same exact noise as you when in 6th gear and I think it's probably a CSB but it could be the diff itself but that is not very likely. The noise appears around 70mph when partially on throttle. As for the thump it's your front diff bushing that worn out.
 
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