I am looking for a way to lift my Sierra Denali, but i'm not sure about what can i get to lift it. I'm looking for a 2" lift. Sorry, english is not my first language.
When you lift a Quadrasteer, you can't adjust the pinion angle much because you screw up the caster on the rear tires. I don't think your going to be able to get even close to the pinion angle you need with a 2". You will have vibration issues with lifting that type of truck.
To fix for this issue is to index the knuckles- cut them off and weld them the proper degrees back to stock. Take note that when setting pinion angle, however. You will need to watch your rear-steer caster. If you rotate the rear end too much you may end up with weird handling and increased wear on the components in back.
The ONLY difference to lifting a Quadrasteer to it's comparable 2wd equivalent is the addition of the wiring harness for the rear-steer. On the pinion angle, if you had a CV joint made to replace the rear driveline, that would address the pinion angle set to stock without having vibrations. On the driveline angle issue, you have two choices:
1. Use double-cardon or cv joints in place of u-joints, or
2. index the rear knuckles (involves cutting the axle tubes and re-welding the knuckles at a different angle- sounds like a big job, but piece of cake for a competent shop)
The good news is that all the Quadrasteer components are attached to the rear end itself and all self-contained, so lifts are no harder than any other 4wd or 2wd. As was mentioned, just extend the electrical wiring and go as high as you want as long as you address the pinion angle and the driveline vibrations issues!
Hope this helps
Molson02536