Help finding factory ride height

[69 sub]

Hi, I have a 1969 Suburban half ton 4x4. I'm trying to figure out how much the suspension has sagged down over the years. I'm thinking about revamping the suspension over the winter but I am really curious to know where it'll get me. Any help would be appreciated!

[spatz]

check with a front end alignment shop. they should have a ride hieght book or know where to find one. I know that midas muffler used to have them also.