Gears for 40 inch tires

Mach1mike

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Looking to get 40 inch tires on my 2018 super duty with 3.55s currently. Trying to decide between 4.56 or 4.88. I dont tow truck is just A weekend warrior and trips out of town now and then. Like some recommendations.
 

Addicted4

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New tire divided by old tire times gear ratio will give you new gear ratio

Ex: 40/34x3.55 equals 4.17 gears to put you at stock
 

Addicted4

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Math doesn’t take into consideration of rotating mass so 4.17 would compensate for tire diameter. Like stated 4.30 is what I would go to.
 

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