Why in the world would you feel uneasy by a 2500 cruise rpm? I have 3.73's in my car and it's no big deal. Now, when I had 3.23's in my '66, the 70 mph cruise was closer to 3500 rpm or there abouts. No overdrive. Overdrive is there less to reduce engine wear than it is to help the newer cars pass the stringent CAFE numbers.
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