2013 YukonXL 2 speed Transfer case change to 1 spd

[1stYukonXL]

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?

 

[Fless]

Moved you here for more focused potential answers.