Just want to throw my 2 cents in, we went from a 235 70 16 to a 235 75 16 and the tire shop unpluged the battery and waited for 30 mins, pluged back in and told us to take for a good run to have the computor reset the speed sensors as the tire size is not that much differance. I must say that this jeep shifts so much better then before, no more gear hunting and no more lugging up hills, shift response is much quicker and smoother.