hey im about to order the tuner cause i FINALLY have the money saved up.. and i was wondering what is the 4 digit calibration code.. and for the tire size.. can i put 33x12.5x15 or do i have to change it to metric ?

 

tires about 31 inches are almost always standard, at least offroading tires. I bet a lot of low pros are metric but oh well.

 

Leave the tire size as is. The 4 digit calibration code is at the passenger side firewall on the back of the PCM (You will see a big rectangular plug there). An example of the code is "BRN3".

This may help you some:

 

you need to put the exact tire size in, what is printed into the tire.