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Speed recalibration

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I have a 2017 Sierra 1500 5.3 4x4. I just picked up the truck today after getting 4.56 gears installed. I noticed my speed on the dash is about 15mph faster than my actual speed, according to the speed app I was using. How do I get this recalibrated? 




Edited by jsumner83
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Yep, gear changes will need a professional tuner application.
I do have "professional" tuner devices such as the FlashPaq (which is very good, IMO - it's a Holley branded tuner) which mainly correct for tire size.
I could be mistaken, however, as I've never performed a gear ratio change.
My Autel MaxiSys can, also correct for tire sizes but I bought that after I bought the FlashPaq. Not sure about gear ratio changes (see above.)

Edited by MikeBMW
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