Engine RPM with 35” Tires

20Bronco21

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I need some information an gearing, assuming the Sasquatch Package is ordered with the 4:70 gearing, V6 with 10 speed auto with a 0.63 tenth gear, what would the engine RPM be at 60 mph? I plan on mostly highway usage and do not need to have the engine turning 3000+ RPM to run in the 60 to 70 mph range. I have no experience with tall gears and big tires, I need some enlightenment.





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Zinn

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I think it would hard to be able to estimate without better weight info -- and a tachometer :-x
 

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Not sure how accurate the online RPM calculators are or my ability to use them correctly, but with the specs you listed, they are all showing between 2270-2280 RPM at 80mph.
 

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60mph will be under 2000rpm with Sasquatch
 

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Not sure how accurate the online RPM calculators are or my ability to use them correctly, but with the specs you listed, they are all showing between 2270-2280 RPM at 80mph.
Glorious
 

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MPG is the next question for Sasquatch. I can see it being 15city/19highway for the 2.7. The Bronco will have heavy tires, turbos and unfavorable aerodynamics.
 

Laminar

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Here's my spreadsheet for the Bronco with the 10R80 and 35" (actual 34.4") tires.

Assuming full torque converter lockup and a true 34.4" diameter, it'd be 1753rpm @ 60mph.

bronco-rpm.PNG
 

Nickp

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Here's my spreadsheet for the Bronco with the 10R80 and 35" (actual 34.4") tires.

Assuming full torque converter lockup and a true 34.4" diameter, it'd be 1753rpm @ 60mph.

View attachment 17171
Oh buddy. I’m definitely going to remove the speed limiter so I can hit the 205 mph top speed 😂😂😂.
 
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20Bronco21

20Bronco21

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Frank N

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In the available factory configurations, 35's provide the most smiles per gallon.
 

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