How is it going out there in the Chevy world. I have recently purchased a 2009 Z71 Tahoe (not 4X4) thumbs down on my part! but it was for the wife and she liked it. Well we move to WV and I was thinking of converting it to a 4X4 vs trading it in, too much negative equity in this one right now. Has anyone done this before or tried to do this before? if so is the cost crazy? Was there any issues with programming in the ECM or anything like that? Any info is helpful.