contrary to popular belief
there is nothing inherently different from a stock vehicle to a ssv/ppv other than having less options (deletes)
physical differences are going to be a 1" lower stance, steel wheels and high performace brakes and oodles of extra wire.
all the other differences are going to be custom programmed per the order request from the department it was originally sold to.
so any referennces to that will be on the upfitter guide.
things that won't be found anywhere other than by other members or owners or by looking is where why and how things were typically done, like cut wires or rear door locks disabled, etc (there is no guide for that)
otherwise all gm owners manuals are on the gm website in .PDF format for all years/makes/models that are available from old to new 100% FREE