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Re: Rear Gear change for better mpg
If you do have a 2.73 gear, you didn't need a 700R4. In OD you are totally lugging the engine, which will actually get worse mileage and is not good for the engine in general. With the .64 OD ratio in the trans, you should be at a 3.50 or 3.73 ratio.
Most older engines seem to like a cruise RPM in the 2200-2400 range, as they are most efficient there. What's your OD cruise RPM?
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