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jimh406's avatar
jimh406
Explorer III
Nov 16, 2016

Remembered why I got a F450 with 4.30 gears ... observation.

During the past few days, I drove my daughter's families stuff up from El Paso in a 36 ft Penske truck. We were 23,400 according to the Cat Scale. We made it ... a little brutally slow at times. We ...
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jimh406's avatar
jimh406
Explorer III
Nov 26, 2016
Kayteg1 wrote:
So where is the fuel saving coming from? Thin air?


We've probably beat this one to death ...

You are assuming that the vehicles compared would be able to do the same speed with the same RPM. That's ok, but means that you also have to agree that 3.73s don't have any advantage in mpg over 4.30s in the level ground case. They would simply be substituting transmission gearing for rear end gearing.

If that is true, there would be no purpose of having more different rear end gearing.

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