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Axle, gear ratio change for economy
Can anyone direct me towards a source for understanding axle/gear ratio's and the effect on fuel economy.
Currently we have 4:10's in our E450, performance is far more than adequate and I am curious as to how going to a lower ratio (?) might change things.
I am in the process of looking closely at a Gear Vendors aux transmission and the reduction in rpms is significant, got to thinking that a rear end change might be a simpler way to get a few more miles per gallon.