Since new (bought last month) I've been hearing this low level siren sound emanating from my '04 V8 Limited starting out in 1st and 2nd gear (when the gear selector is in "D" mode). If you turned the radio off you might think a cop was coming up on you with sirens blazing. Its not that its loud and with the radio on you can't hear any of it. And hell if I know if its being caused by aerodynamics or the gears in the gearbox.
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But is it natural?
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But is it natural?