[arkracing]

Originally Posted by Yukon Jack

arkracing - The Chevy restoration packet shows there is a difference in the 10 and 20 frames. My packet does not give info on the 30 frames. The section modulus varies between each. I find the following definition: The section modulus largely determines the flexural strength of a beam of given material.

What I think that means is that the frame's ability to flex must be different and that affects the overall strength of the frame.

The packet gives the following frame info for the C and K series:

C10 (Except Suburban Carryalls) 39,000-lb-test steel; section modulus 2.98

K10 (except Suburban Carryalls) 39,000-lb-test steel; section modulus 2.70 (KS-KE107 models; 3.48 (KS-KE109 models)
C10 Suburban Carryalls 39,000-lb-test steel; section modulus 2.98

K10 Suburban Carryalls 39,000-lb-test steel; section modulus 2.70 (KS-KE107 models; 3.48 (KS-KE109 models)

C20 (Except Suburban Carryalls) 39,000-lb-test steel. All models except Longhorn: section modulus 3.71. Longhorn: section modulus 5.05

K20 (Except Suburban Carryalls) 39,000-lb-test steel; section modulus 3.48

C20 Suburban Carryalls 39,000-lb-test steel; section modulus 3.71

K20 Suburban Carryalls 39,000-lb-test steel; section modulus 3.48

Thanks. I know you posted something like that in my other thread just less detailed. Thanks for taking the time to put that information up

I still have no idea what a "section modulus" is - it appears that K20 and K10 (KS-KE109 Models) are the same. (well the parenthesis are a little confusing - but I'm interpreting it that way)

How do I find out if mine is a KS-KE 109 or a KS-KE 107?

What the heck Googled "Section Modulus" and came up with:

section modulus (′sek·shən ′mäj·ə·ləs)
(mechanics) The ratio of the moment of inertia of the cross section of a beam undergoing flexure to the greatest distance of an element of the beam from the neutral axis.