Transmission shift points after larger tires

[Robb8]

Hey guys I’m getting 34.3 cooper STT pros on 18 fuel vapours , my question is about transmission shift points as I’m being told they will have to be calibrated afterwards current tires are about 31’ on 20’ ... I’ve read a few posts saying that calibrating your speedo helps with this but others saying it’s independant from the speedo but does not require any calibration any thoughts ?

2018 f150 lariat 5.0 , 3.31 gear ratio

[tha5150]

Interested as well. Got 33 Toyo’s And when I changed to recommended settings, the mph was 3 over. Factory settings were right..?? Makes no sense. Then I started thinking about the shift points and been scratching the noggin.

[theandies]

Transmission adaptive learning will reset if you disconnect the battery. That's should do it.

[mtnbiker995]

Is there not a way to reset the adaptive learning tables with FORScan?

[mtnbiker995]

Back home and can mess around with it. If you are interested in resetting the adaptive learning tables, you can do so with FORScan. Under service procedures, TCM, clear transmission adaptive tables.

[Randy2015]

My 15 F250 came with 17's I am guessing.... I updated to a 265/75/20 (not 100% on the 75 part cannot remember) anyways my speedo still isn't right however trans shifts fine snap a GPS ap and double check speedo is my advice... the TCM will handle rest