There are 63,360 inches in a mile . Take some string and wrap around the circumference of the tires on those 35"wheels and measure the length of the string . Divide 63,360 by the inch length of the string, and that will give you REVs per Mile if your Maxi Sys gives you the option to edit  Revs per mile.

 Hey just curious if this worked?

Hi! I'm trying to do this for my 22 2500 and I can even find the menu, it does not appear
under hot functions or bcm, could you please let me know if this is located somewhere
else.

Think you