I used the pro cal to "0" out my tpms, correct my speedo, higher winching idle, etc.... It also has the option to input the gear ratio (5:13) which I'm not completely understanding what was done as I have not noticed any difference. I have a 6 speed..... Is that function for autos??

Justin

 

Gear ratio still matters for manuals. It tells the ESP program where you are starting at.

 

So if I notice zero difference how would I know it's doing its job?

 

it is keeping you out of limp mode so it is doing its job, if it was not doing its job chances are you would know it..

 

From what I understood... if you re-geared without re calibrating, I heard that the vehicle would be in limp mode immediately once you started the vehicle following the re-gear. Isn't this true on the 2012's and up?