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Old 05-14-2020, 07:13 PM
Mach1mike Mach1mike is offline
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Default Gears for 40 inch tires

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.
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Old 05-14-2020, 10:06 PM
Addicted4 Addicted4 is offline
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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
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Old 05-15-2020, 07:06 AM
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Lt.Dan Lt.Dan is offline
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I would get 4.30s, it'd be a nice match
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Old 06-29-2020, 04:22 PM
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That’s bad math. Actually need to use the final gear ratio.
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Old 06-29-2020, 05:31 PM
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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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Old 06-30-2020, 06:45 AM
Mach1mike Mach1mike is offline
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I have a 32 inch tire from Factory probably going to go with the 456
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Old 07-01-2020, 06:54 AM
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What is your factory tire size?
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Old 07-01-2020, 07:46 AM
Mach1mike Mach1mike is offline
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32 inch
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