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Re: 2 piece drive shaft to 1
Maybe.
It wouldn't be noise from the U joints, because the frequency emitted by those (2nd order of shaft rotation) is not in the audible range.
However - sometimes a one piece shaft will transmit rear axle mesh frequencies through the air. It's perceived as axle whine, but you can hear it outside the vehicle rather than inside (the GMT400 trucks with a carbon fiber shaft were particularly bad about this). It will vary based on rear axle ratio but should be in the 370 hz range.
I have never heard of a steel shaft doing this but we've never discussed the hearing aid interaction either. (Maybe it's always been there but we didn't have 'bionic ears' to pick it up - lol)
Probably wouldn't be able to tell further without actual testing. But - the good news is you are not damaging anything so I wouldn't worry about it.
K
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