I have this problem as well, I have the bilstein 5100, shop set them on 7, and 1.5" spacers on rear. My issue is, when I hit railroad tracks, it sounds like the struts ate loose , or banging, upon looking I found my lowers are hitting the knuckles, I'm not sure if that's the sound I'm hearing, I don't have off road group and not a rebel. I have 4x4 southwest edition , which comes with skid plates and tow hooks, but no lift from factory. Bilstein says my truck is ok at #7, and I don't need ucas. The shop that did them, well so busy that I gotta leave truck for 2 days. Any advice??