is frame section modulus the frame height?

[G-NUT]

I'm trying to find out the frame height under the doors of a 1984 chevy suburban. I think it's a C10 but it may be a C20 ... looong story. I won't have it in my presents for another month but I'm trying to do some preimptive stuff. I found a 1984 chevy suburban spec sheet from the gm heritage site. I has good info but there is a spec in there listed as frame section modulus with a numerical value beside it. I'm wondering if it is the frame height value I'm looking for.