I posted a while back about some creaking I've been getting from my 83 K-5 with 4" rancho lift (all spring lift in the rear). I tightened down the rear U-bolts as tight as I could with an extra long socket wrench, and things are a little better, but not all fixed. This makes me think I'm on to something. The thing is, the whole area is kind of rusty, so I'm partially torquing the nuts down, and partially fighting the rust. My question is, can I go crazy on these things without worrying about hurting anything? If I go at them with an impact wrench, do I need to worry about damaging the axle tube or anything like that? Thanks!