from what I have seen on this GMC it appears to be a good 8". Axle angles are the same as if you turn the torsion keys to add an additional 2" . Therefore, it leads me to believe it's a 6" kit with torsion keys turned up a bit. The aforementioned GMC owner didn't install the kit, it was done at a shop, so there is a lack of information there. I'm just debating to spend the money on the Rcx or keep looking, bulletproof makes a kit (req minor mods) mcgaughys Makes one as well but am unsure of quality. I am not looking to drop 4-5k on a CST lift.