Suspect wind noise or you might check to see if it's electronic... even if
radio is off.
Also the trans sometimes whistles.. check if you hear change in pitch as you
accelerate... I assume it doesnt ONLY appear at 60.. must happen other times.
I had a similar problem on a 96 grand marquis (same car for all intents and
purposes).. turned out to be a bad seal on the bottom left corner of the
windshield. only happend around 55mph, went away after 65-70 or so... just
encouraged me to speed :(
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