DO NOT just raise the front 2-1/2", All H3's are slightly different. You may go too far. Concentrate on the 23-1/2" measurement.
You do not need extended shackles in the rear. In fact if you put longer shackles on the back you will have a rake again like before you leveled it up front. You will never get it level if you make the front 23-1/2" and the back goes to 24"+ adding longer rear shackles.

You did read this, right? https://www.hummerforums.com/forum/h...ics-how-11428/

 

Wow that's some really good information. So the 23 1/2 measurement is key.
I do have to buy shocks, mine are blown now big time, and the roads here are made of shell Marl which is nice and hard, but the potholes are ultra hard and jagged too.

I had to drive through 7 miles of this several times till the river that overflowed its banks finally went back to normal. So giving the truck a 1"+ lift is important now.

 

What if some us like the forward rake?
Can you raise the H3 and keep the rake?
There must some advantage to the rake or GM would not have designed it that way.
I've seen a lot of lifted Hummers in Florida, then recently I saw a lifted raked H3 with big tires, and it looked beautiful.

 

Here is the super secret special reason GM reason..... 1) NTSA bumper to bumper crash height requirements; and, 2) fuel economy.

New truck bumpers can only be so high off the road so that when you crash into a car, the bumpers make contact with each other instead of the truck riding up over the top of the car bumper.

The rake also keeps more of the front bumper in in front of the front tires and allows less wind under the truck. When you lift the front you open up more of the front edge of the front tires which is great for off road, but not so much for fuel efficient aerodynamics.

Leveling is just making an adjustment, you can adjust it for any amount of lift up to the max of 23.5" and leave in as much rake as you want.

 

So you think a front air damn would help keep the air from under he truck and gain efficiency or the larger frontal area would negate the effect?

 

Thanks Doc Olds for clarifying.
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Question: Has anyone lifted ( torsion-ed ) their front up, then add shackles in the rear, to keep the forward rake? ... Pics?

 

I did.