I disagree.....the ONLY thing that changes is....
the car height is lowered 2"......the geometry angles stay the same.....the instant center remains the same. spindle height has NOTHING to do with instant center.
unless you are putting the car back at the ride height you had, but then why would you install a 2" drop spindle?....they are to DROP your nose 2"
the drop spindles (PST) I have had leaves everything the same, just places the actual spindle 2" higher....to lower the car height.