Cross posting this from the lowering pinned thread if anyone is interested:
I got the Belltech 2" lowering shackles put on. Personally, I left the 1.25" blocks on the axle to keep a short rake just in case I choose to get another boat again or something of the like.
Installation was pretty straight forward. I'm fortunate enough to have a friend with a two post lift. We removed the OEM hitch and then began breaking down the rear shackles. Being it was on a lift with only one large floor jack, we choose to gain clearance over the frame rails by disconnecting the bottom shackle bolt and lowering the truck onto the floor to lift the top shackle bolt above the frame. Right away we ran into a problem in that the bed seam was contacting the shackle. Back up in the air and some taps with a ball peen hammer, the bed seam was folded over and it was smooth sailing from there. Final measurements came down to 1.25" higher in the rear which I was okay with as aforementioned. Total install time with a two post lift from hitch removal to hitch installation was 2hrs 15 min with two people and mostly hand tools. Will post pics tomorrow.
*EDIT*
Also, I used to have this obnoxious ever so slight shake in the seats at highway speeds. Wasn't the typical GM shake that has been documented but something that bugged the hell out of me. That shake has also been resolved and the butttest attributes that to the lowering the truck a touch. Additionally, the ATROCIOUS leaf spring creek is gone as well. That could from getting some weight off the springs with the truck in the air but I doubt it (never noticed it resolving after an oil change). Time will tell.