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It would be interesting to know just what failed in the rear end. I have never heard a differential sound like that. Wow.
The pinion nut came loose.. Why you accelerate the gears tend to push apart which forces the pinion against its large bearing & the position is relatively normal, but then you let off the gas the gears tend to draw together the the pinion is drawn into the ring gear... If you look it's fairly common to see the carrier have tooth wear marks all around just inboard of where the ring gear rides... I suspect this carrier will show those marks....
I've had the pinion nut loosen on a Dana 60 and it sounded nothing like that. It was more of a 'singing' noise (if that makes any sense) on coast. The actual end play on the pinion before I tightened it up was about 0.080" IIRC.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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