I installed the Belltech 5305 rear spring kit on my wife’s ‘13 Yukon for a 3 inch drop. I was inspecting the springs today and noticed the driver’s side spring was too close to the frame much more so than the passenger. I don’t hear any rubbing, but it seems too close for comfort. Is this normal or might the spring be seated incorrectly? It looks like it’s correctly seated.
I always thought those coils gave at least a 4" drop. Did you measure before and after to know for sure? How does it ride? Did you do the free travel mod? Shorter shocks or extenders?
As for your axle location issue, it's because you need an adjustable panhard bar. The bar swings in an arc as the suspension cycles up and down, so the body is pushed or pulled side to side. The panhard is set to have everything mostly centered with the vehicle at its stock height. When you lower it, you're holding the suspension in a position as if it's compressed so the swing of the panhard has the body pulled to the side more than at stock height.
See how the tires are centered then not centered in the fender wells as the suspension cycles? An adjustable panhard will let you lengthen or shorten it to re-center the axle at the new ride height. I have a Spohn panhard on mine with a ~4" rear drop.
If you can weld and wanna save some cash, you can cut your stock panhard, center the axle at ride height, overlap the two halves of the bar (you'll be shortening the bar to center the axle) and weld it back together.
