Tire size

 
If your rig is setup to handle 38’s it’s setup to handle 40’s. If your rig is setup to handle 37’s it’s not setup to handle 38’s.
 
If you were to choose between 37s or 38s what would you go with, being that your rig is setup to handle both?
37's all day long. 38's literally cost more than a set of 40's and if you're in a pinch and need to buy a second spare while on a long trip, 37's are widely available and can be found just about anywhere.
4.88s. Leaning towards 37s.
That is the correct ratio to bring you back to stock performance.
 
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