i bet you'll love your resale value runnin 39s!!! so your sayin the miles go on slower from bigger tires, makes sense!
I have my tires n gears programmed into the computer so everything is correct... haha A larger tire travels further in a single rotation than a smaller tire
Yeah I got mine programmed too, go to your tire manufactuers website and it should tell revs per mile.
He ain't gonna do it... I hope not at least, he's gonna hafta buy a bunch of new mounting bolts too, unless he kept the old ones... I keep everything and I threw mine out cuz I knew I never wanted to get into that again! I'm sure he'll just find a way to increase his MPGs