I believe the sound is not necessarily just "reverse"... but any time the vehicle is operating on electric-only power. Which is always the case in reverse, because there is no mechanical reverse in the transmission - the reverse function is handled entirely by turning the motor backwards.
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keith k
70 Trans Am RA III / T400 / Lucerne Blue / Bright Blue
70 Trans Am RA III / M20 / Lucerne Blue / Sandalwood
70 Formula RA III / M21 / Lucerne Blue / Bright Blue
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