Speedo reading high on 14' 2500

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padrummer1

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Hemi 6.4
Hi all,
I just recently got a 14' 2500 4x4 with the 6.4
By using a GPS app on my phone, I was able to confirm that the speedo is reading high. Showing 71 mph while actually traveling 65.
I know that the previous owner had been running larger tires because I can see some marks. The truck currently has the factory TransForce 275/70/18 tires.
Any thoughts on how to get it adjusted properly?
 

6.7CumminsDrvr

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You can take it to a dealer since you’re running stock size tires.........BUT I wonder if the truck had a tuner on it to adjust the tire size?
 

4x4x4door

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It can be adjusted without a tuner too. The AutoEnginuity software comes to mind.

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