So I was outside after work today looking at what it would take to take the rear end out of the 01 Z71 donor. I noticed the leaf springs were different than the ones on the 2006.
Here is a pic of the ones off the 01 Z71.
Here is a pic of the ones off the 2006 4x4
So maybe the 2006 4x4 didn't come with towing package or something so came with weaker springs? I measured them and from axle tube to top of the spring on the 01 is 5" and the 06 is 4". So looks like when I do rearend swap for 3.73s I will gain an inch of lift! Woot woot! Free lift haha.
So I got froggy and pulled the rear and front end.