This is what I thought too. The center bearing supporting the driveshaft is so common it is predictable in any high mileage 240. My impression of the sound is jet engine getting ready to taxi, or old fashioned fire engine siren.
And, working with the differential is so stinky, I'd rather change a "good" driveshaft support and bearing than take the cover off of a pumpkin and expect to diagnose it.
http://cleanflametrap.com/pumpkin.html
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Art Benstein near Baltimore
"Middle age is when a narrow waist and a broad mind begin to change places." -E. Joseph Cossman
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