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How Much Would My Gas Mileage Increase If I Put In A Higher Gear Ratio In My Truck? |
I have a 3 scramble auto transmission and when it goes out i might put a 4 speed auto transmission would that increase gas mileage by a good bit. I drive a 1978 GMC Jimmy that gets 10 miles a gallon.
Not unless the fourth implements is overdrive, which most four speeds aren't. Most three and four speed transmissions are a 1:1 ratio in their final (intoxication) gear so the engine is turning the same RPM's, for any given speed, in both. The only thing
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