I have to say that I have been doing this along time and I have never seen sway bars, short arm lift, coil spacer nor the rear shackles directly cause dw. The alignment certainly can but caster needs to be checked and that can't happen with a tape measure. Short arms/coil springs spacers could cause an issue where it threw caster off but adjustable arms could fix that and so could long arms. The rear suspension has nothing to do with the front shouldn't have an effect on dw. The tires could be a culprit for sure so I would start there and get a computer alignment and see what it says there. I would hate to see someone through parts at it.