Ahh gear ratios, went through this with my Jeep that I had. If ya'll don't mind I will pass on my experiences.
When you put on tall tires you are changing the effective gear ratio. Putting on bigger tires and keeping the same gears will reduce the engine RPMs at a given speed. Where I live I have to go through 20miles of rolling hills that there is a 1200ft changes. Towing the #1900 popup was a chore and usually got <10 mpg.
When I had 3.73 and stock 32" tires, I could not keep it in OD (6th) because at 65 the rpms were so low that the computer would drop it down a gear. When I went to 35s, it got worse. I put in 4.56s and all was good. My engine speed went up 400rpms. Because of it staying in OD, my mpg actually went up because stock the rpms were higher in 5th than modified in OD. Towing was vastly improved, I was pulling easy 15mpg towing. Now if I lived in flatlands, the opposite for mpg would probably would have been worse.
Here is a formula that if you change tire size it will give you the needed new gear ratio to keep the "performance" the same. If you want more grunt, go higher numerically. If you want better gas mileage, go down a step. In my Jeep example 3.73 with 35 was calculated out to 4.10s(4.08), I wanted a lil more umph when towing so I went a step up to 4.56.
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With the current truck
http://www.4lo.com/calc/geartire.php
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Here is a calc that you can change the numbers around to see mathematically how the mods would affect the engine speed. Trans Ratio is where you would put in the OD. For the auto Jeep was .80.
Current truck assuming .80 OD (just for example)
https://www.crawlpedia.com/rpm_gear_calculator.htm
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Stock (3.42 & 33") 3.42=1811
With 35s @65mph and a .80 OD
3.42 = 1707 rpms
3.63 = 1812 rpms
3.55 = 1772 rpms
3.92 = 1952 rpms
Now I can't find my other calc that shows the affect on speedo from all the mods, but just putting on 35s will
change the actual speed @65 to 69mph (+6%) and 37s to 73mph (+12%).
They say, who ever they are, that a speed differential of > 10% needs to be reprogrammed for the affects on ABS & trans shift points.
So in the end if I wanted 35s, I would change gears to 3.55 (1772 rpms). For 37s change gears to 3.92 (1851 rpms) to keep the performance level the same.
Here is another link to full calcs from Crawlpedia
https://www.crawlpedia.com/calculators.htm
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