for an altitude adjustment. I can't stand these wheel wells not being filled up. As far as how low, my truck is a 4x4 and the only possible way to drop the front is 2" spindles. So it's looking like it will be a 2/5. The rear will be 2" shackles, block removed (1.5"), and either new leafs or remove the leaf above the overload for another 1-1.5". Anyone see a problem with this? I mean other than the fact that its a z71? Lol