Summit white I just did the exact same thing. I love everything about the truck, was out in the bush, went to test my dealer lifted 4x4 badged truck with 33.2 inch Toyo RT tires. I pressed what I thought was a cool 4lo button with a picture of a truck crawling over rocks... In the same spot 4 lo is on every other ****ing Gm product and its something completely not 4 low . I love everything about the truck, and would rather put the 2 speed tcase in it and have the perfect truck for me! I'm going to look into the swap aswell. I see you posted last year, have you come up with anything? I can't find anything about it.
