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**Yukon Jack** · 10-13-2006, 09:52 AM

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

10-13-2006, 09:52 AM	#64
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,683	Re: stock 4x4 pics...anyone? 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 __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 Last edited by Yukon Jack; 10-13-2006 at 09:54 AM.