OK, so if I understanding this correctly the horizontal bolt though the leaf spring bracket goes through the lower brackets welded to the axle housing. The upper bars connect to some other bracket on the chassis(floor). Your mod is to move the leaf spring bracket to the top of the spring instead of the bottom. (for lower ride height?) The thing that would concern me is how much the pinion angle will change due to non-equal arcs. The other concern is how strong the new axle brackets are but I'm sure some of those concerns could be mitigated with bracket design. Will be interesting to see how it works for you.