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If you go to a 20" tire size that is the same diameter as your 17" tires the answer is no.
 

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No, but you may need to have the truck told it has the bigger tires though DEPENDING on what tire size you go to and tire size you came from.

Not 17" and 20" but rather actual size.


For example if you currently have 265/70/17's and go to 275/55/20's they are almost the same size and your speedo would only be off a hair. 31.7" (17's) vs. 31.9" (20's).


BUT if you go to the stock 20 (for 2018 down, 2019 uses the above size) of 275/60/20 they are 33" tall and you would need to have the truck configured to that size tire for the speedo to not be off by several mph.
 

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Then you would need to have the dealer tell your truck computer that you have the optional 20" tires on.
I had to do that on my Outdoorsman when I went to 20's.


Be prepared for a huge handling improvement!
 
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