Ok, this might get a little long, but I just want ya'll to know how I got here. I've heard that 6" is about the limit, but here goes: I started out with a 4" all spring Pro-Comp lift and 35x15.50 TSL-SX. The width caused them to rub when lightly flexed. Trimmed the fenders slightly. Added ORD zero rates to the rear to fix the K5 "saggy butt". Wasn't tall enough. I bought 3" blocks for the rear, moved the zero rates to the front and added 1" lift DIY 4x4 shackles. 7" rear, 6" front. I just installed a ORD 1" body lift and body mount bushings, which gave me about 1.5". Total lift of 7.5 to 8". I bought some 38x15.50 TSL Radials from Mr.Chevy4x4 Saturday. The fenderwells are FULL of tire now. I'm pretty sure they won't rub, but I would like a little more room. I am thinking of buying 6" springs, and replacing the 4 inchers, and leaving all the other stuff there. This will give me 9" in the rear and 8" in the front. Will this be too much lift for the factory driveshafts? As of now, I have no driveline problems. Thanks for any advise/help/comments.