regarding hill 4wheeldrive 1" front spring shackels. "Many front lift springs come with a shim already incorporated into the leaf pack to help with the driveline angle; this can sometimes create an undesireable castor condition (wandering etc), and the shackles may actually improve castor, yet bring the pinion angle back down again." andIt is typically better to try the shackles without shimming first (if using lift springs with a shim)---Just keep this in mind when fine tuning the castor and driveline angle: If the thick part of the shim is toward the FRONT of the vehicle, these shackles will counteract the shim's effect, if the thick part of the shim is toward the REAR of the vehicle (probably done for castor alignment), then these shackles will exaggerate the shim's effect". /forums/images/graemlins/thinking.gif ok the principles are pretty straitforward, but a few things I need to know. -how does castor angle cause wandering? -I want to run this together with ORD's 1" zero rates; will that balance things out? -I have 2degree shims that came with my springs -what would the actual lift be, all I'm really trying to do is level out my shortbox and get as much flex as possible. Will this be too much lift then (front too high?). /forums/images/graemlins/dunno.gif will the suspension guru's please come out?!