It was the same way with the 5.4l and 6.8l SDs as well. The salesman and managers that do the ordering have it in their head that 3.73s are some gas saving mpg miracle and you will never pass a gas station with a set of 4.30s. Its not their fault really they are too dumb to know better and too lazy to educate themselves. The problem is they pass on their flawed info to the unknowing consumer.

Rant over.

Order the truck and get 4.30 gears. If the dealer won't order one find another dealer.