Something I remember in my research last Summer, the general consensus is if you stay under a 2.5" lift the factory components are safe. The Bilsteins go from something like 0.7" to 2.8". My understanding is throwing a 3" block on top of the shock tower is where the trouble begins. If I got bum information I guess I'll find out in a few years. I put about 8,000 miles a year on my truck so it may take a while.