My JK came equipt with the scrawny 16" steele wheels with 225/75/16 tires.
I added Wheels and 265/70/17 Toyo MT's. The speedometer and Odometer are off now. Speed is off by 5 mph(reading 55 doing 60 on gps) and the Odometer is off by 10%.. (odometer reads .9 miles but actual distance is 1.0 mile)
The dealer says they should be able to program for the correct tire size (32") or get really close..
So my question is... If they reprogram, would it do anything else to the shifting points or other performance characteristics, or is it just going to fix the Speedo/Odometers?? Its a 5 speed Auto-- if that matters.
Other than accuracy on speed and distance is there any benefit by getting it done?? I kind of like the idea of saving a few miles and leaving it as is.