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The late 70's Cadillac Seville came stock with 2.28 some say 2.29 rear gears. The gm 7.5 could be had all the way down to a 2.14 that came in some 79 or 80 malibu's there are ford rear that can be had in a 2.41 so tall rear gear won't be to difficult. I will pic rear axle ratios after deciding on engine trans wheel and tire to get the best flat ground cruise rpm at 70-75 in top gear. I'm thinking 1300-1700 rpm range. I am most concerned with highway mileage. That is why I asked about a light but more importantly aero platform to start from. The Malibu are shaped like a brick as are most cars that fit my size and rwd requirements.
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