Gears and mileage
3.73 is the way to go with the AOD transmission.
The highway RPM's will be well within the 2000 range and gas mileage will hardly be affected.
The myth of poor gas mileage with a numerically steeper rear gear is way, way overblown and shouldn't even be a factor in your decision.
With that more realistic attitude toward the effects of gears on your mileage, think about 4.10's.
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