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YES , IT'S BASIC MATH! Also depends on how the vehicle is driven, the state of the vehicle as far as what maint. has been done.

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Q: Is a 3.55 rear end get better mileage then a 3.73?
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The 373 is a lower ratio than the 410.


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Typically if this is a Chevy 1/2 or 3/4 ton two wheel drive with 373 or better rear gears you should get 10-12 mpg. If this has dual wheels and 410 or higher you might get 7-9 possibly 10 if you got the wind to your back and are on the decline of a really steep hill.


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