A few months back I put in a 2" and it actually made the front look higher than the back, but measuring from the ground to the fender at the center of each wheel all 4 corners measured the same (37" +/- 0.25"). Installation was a pain due to the front CV shaft being in the way of getting the 1 bolt in so you have to disconnect the tie rod and upper ball joint from the knuckle so you can swivel it out of the way enough to get the bolt in.
When I recently replaced my upper and lower control arms due to ball joints being bad, I decided to go a bit different route. Since I was removing the struts anyway to access the upper control arm bolts, I wanted to used a spacer at the top of the strut, but those usually require cutting the 3 strut bolts a bit shorter so they fit into the spacer. I didn't want to do that, and the Z55 electrical connector on the top of the strut wouldn't be able to be connected due to it being ~1" lower in the mount.
What I finally came up with was a thinner spacer for both the top and bottom of the strut that uses the existing mounting bolts/studs. Both spacers are about 3/8" thick and it puts the front measurement at 36.75" and the back still at 37".
Also, those little brackets that extend the Z55 level sensor rods in the front aren't needed if you have a Tech2, or know someone who does (or even at a dealership) and you just do a "ALC Reset" and it will baseline the front sensor readings.
These are the spacers I used. They both say 1/2" lift, but using them both gave me 1.5"
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