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Ok this is probably stupid questions for the Oracles here but I’m still learning after 3 years.
I recently changed my wheels on my 2016 SW 3500 to 20” wheels actually 18” Denali wheels to 20” Denali wheels ....yes I don’t tow heavy with it. I originally tuned the truck to the tire size of 275/70r18. Since then things changed I switched autocal to moonshine and retained my Duramax Tuner Trans tune. Now that I have changed wheels and tires to 275/65r20 my speedo is off by like 7mph according to gps plus my shift pattern is shitty now. Will updating my tire size with Tony eliminate this? Are should I seek recalibration of my Trans tune also? I was under the impression from research that now my autocal is hooked to Tony I may have issues with changing tranny tune. I have no problem purchasing a new Trans tune if recal of the speedo don’t help much. Any info would be greatly appreciated from the Oracles.
 
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