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new tire/old tire x stock ratio= new ratio
38/31x3.55=4.35 so since a 4.30 doesn't exist for the front axle you have to go 4.56 to be close to factory equiv. with a 38 and stock ratio of 3.73 the 4.56 comes right in at 4.57 most guys will say to go the next step lower to help compensate for added tire weight rolling resistance drag ect.
so it is up to you a 4.56 would be minimum a 4.88 is a better choice with 37 and larger tires.
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