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3.73 vs 4.11

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Antonio_kheir

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In 10th gear I assume, which is about perfect. Add any sort of load, wind, hill, and especially a trailer and you won’t be in 10th gear.
yes sir. that was assuming 10th gear!
 

jorligan

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There is a reply on f150 forum where they went with 4.11 gears and they report better mileage and performance as it didn't need to downshift as often. I have the 5.0 with Whipple and am getting 4.11 gears, 35x12.5x20 on Fuel wheels, should be getting my truck back in a couple of weeks and can let you know.
 
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Antonio_kheir

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There is a reply on f150 forum where they went with 4.11 gears and they report better mileage and performance as it didn't need to downshift as often. I have the 5.0 with Whipple and am getting 4.11 gears, 35x12.5x20 on Fuel wheels, should be getting my truck back in a couple of weeks and can let you know.
That would be great!
 

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Antonio_kheir

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So I've done some math.... Could totally be wrong as I made an assumption to help with simplification.

These calculations were all performed using a 33" tire from factory:

3.31 -> 3.73 = +12.68%
3.31 -> 4.11 = +24.16%
3.73 -> 4.11 = +10.18%
these numbers just reflect the percentage increase in gear reduction from my 3.31s

Next, moving from a 33" tire to a 35" tire is an increase of 6.06% in tire diameter
the stock hankooks weigh approximately 42lbs per tire, 168lbs total which is ~ 1,411 lbs of rotational mass. A 295/65/20 ridge grappler weighs approximately 70 lbs per tire, 280 lbs total which is ~ 2352 lbs of rotational mass. that about a 66% increase in rotational mass!

So knowing all this, if going from a 33" to a 35" is a 6% increase in tire size, I made an assumption for simplification that it would also equal a 6% decrease in performance. As said before, if going from a 3.31 to a 3.73 = an increase of 12.68%, then 12.68% - 6.06% = net gain of 6.62% in performance. 3.31 to 4.11 would also have a net increase of 18.1% in performance. These calculations did not take into account the rotational mass increase of the tires (don't really know how to do that).

Looking at these rough calculations, this means that even a truck with 3.31s and 33s would perform worse than a truck with 3.73s and 35s? or is this completely wrong?

Hopefully this might help someone if these numbers are somewhat accurate. And if someone is more knowledgeable on this stuff, please chime in!
 

Ranger621

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I have a 2022 lariat with the 5.0 and 3:73 gear with 35's I tow a 6000 pound boat with no problem. If you go to 4:11's your milage is going to suffer and you don't need that gearing for daily driving.
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