2013 YukonXL 2 speed Transfer case change to 1 spd

[swathdiver]

I'm looking at what's involved to change from the 2 speed transfer case in a 2013 to a single speed and/or changing the existing 3.48 rear end gears to 3.08 for better milage. Anybody had any experience or advice with this?

How do you drive the Yukon and what kind of gas mileage are you getting with it now? What kind of fuel are you feeding it? How much weight is it carrying usually?