Glad you got everything ironed out. Just in case you are wondering I used 2400 in that post because I was making a guess at my tire size for 265/70-17 and then rounded down to the nearest hundred. To help lower your % error it is best to use an initial tire size that is way off from what you should be getting. Since most people are looking for the TS of a 35" tire 2400 just seemed to work.
Here is an example of why I start overly low:
If your tire size is 2715 but you start with 2700, your % difference is .5% Your odometer will not pick that up without going 50+ miles.
Now if your tire size is still 2715 but you start with 2400, your % difference is 11.6% and the difference will show up within 10 miles. I'm guestimating on numbers but your truck will be reading a little over 10 miles when the GPS will read 9.
10.2/9*2400=2720. Dang, I guessed pretty close.
