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Others have more knowledge than me (by a long way), but I think you need to say if it makes the noise while in neutral AND the car is rolling.
If you were low on diff fluid, I might suspect final drive gear wear...if so, I think it would make the grind while rolling - even while in neutral.
it could also be the reduction gear set internal to the tranny, but I don't know if that will/won't make a noise while rolling in neutral. since it won't be loaded up my guess is the low would drop off significantly during a rolling neutral.
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