I know at least one of these 3.73 to 3.42 axle conversions has been done out there. I'm not concerned with mileage change to the positive side.
I'm wondering what it cost to convert your 4x4; and if it got your RPM where you ultimately want it. I think I'd like to have the equivalent of a 7th gear. Bigger "tars" are on order. :) I hate not being able to run with the big dogs.