I get about 2.5" front lift over stock with my 881's, 1" lift sleeves and an AOR bumper/winch. Ive ran it a very long time and have not seen really any front sag other than what it lost when bumper was installed.
So with just 881's you get about 1" lift, comparing to your 99 coils you should only net about 1" lift over those coils. Maybe im not thinking this out correctly.
I see what you are saying.
I have let's say 60 pounds off the front of my truck right now? No skids, all factory brackets and whatnot removed, factory turn signals gone, no battery, no sway bar. My addicted bumper is bare and a tube bumper. It weighs give or take a few pounds within what is absent.
It's not like I'm throwing on 150 lbs of plate bumper and winch here. Let's agree on that much. When it is advertised as 2-2.5", I picture 99's installing these and seeing 2 inches. Further more, I am up a perch position on my 5100's, so I expected 2.5 minimal.
I have NEVER seen anyone, ever use these springs and proclaim, I gained 1 inch of lift from these springs. I think I'm without 0.5-1.5" of lift here conservatively. If it bugs me, I'm not gonna ***** about it anymore then this warning implied to save someone else the disappointment. I'm not "mad", I'm just disappointed in what this gave me. I'll order coilovers and UCA next time.
So again, using the 1 inch lift spring theory on 99's, I gained less then their lowest lift rating. I gained 2 inches, at stock weight, with an elevated 5100 shock. Not a bottom perch/non-adjustable shock as most people run. See my point here? I also think any spring will settle a bit, be it 1/4", 1/8" or more. It's just that much less lift they provided.
That's all I'm trying to establish. If people run them, great. If you like them, even better. My point with this was the people who want a particular stance, purchase spacers for a "full 3 inch lift". I don't load my truck heavy, ever. So I didn't want the whole narly raked stance. I wanted as close to level as possible.
If your theory is correct, I will gain only similar height in the rear as well. Which will make me happier, just not having the rake to it. I'll bump this Monday when those arrive and I install them.