I have a '69 camaro with a 502 crate motor and i have the
same problem. This sound only would come on at freeway speeds, and now
its all the time and a lot louder. This noise is from the rear end. In
my case it is because its under to much stress, the stock ten bolt
cant handle 570+ lbs of torque. Since you have a v-6 im not sure if
its from the same reason, but I was told that when you have that whine
under acceleration, it could be either the rear end or the tranny, but
when the noise goes away when you deccelerate, its the rear end. To
answer your question, I would worry, its most likely a sign that its
going to go out. It could get to a point where if it breaks it will
lock up your rear tires while you drive.
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