Is the Auto spring just to raise the front of the vehicle 2.5"? I read a post that it raises the front of the vehicle not the rear.
If this is true, what raises the rear of the vehicle if I don't get a true lift kit installed?

 

True, the AS kit only lifts the front to "level" it out with the rear of the truck. You do not need to do anything to the rear of the truck when adding a leveling kit to the front. I have a 2.5" AS leveling kit on mine and it sits perfectly level from my view.