Here is a picture of my steering setup with my stock CJ springs. Notice the drag link and tie rod are perfectly parallel with each other.
Here is a picture of it with the YJ springs. The drag link and tie rod are still perfectly parallel with each other. Very little lift if any.
I though I was going to get a slight lift, but the YJ springs settled out as flat as the CJ springs. The rear did rise about 2", but that is because my rear springs were trashed.
My Jeep is also very light. Fiberglass everything, lightweight bumpers, stripped of anything not needed.
You can figure out spring rates by measuring the thickness of the spring pack. Here's the specs.