I picked up a set of 4" leafs from someone that has upgraded his to taller lift... and well either the leafs were tweaked from the get go (ok, one side the main leaf is tweaked into S shape by the eye)or I tweaked them on one trail ride or on the freeway (I had them on for less then a month)....... I ended up pulling hte leaf packs off to compare them and one is definately more sagged due to the main leaf issue and when I started to look into doing my own packs and redoing things I gave up...... now I'm kind of moving on to the RE world....
Kejtar