Quote:
Originally Posted by 57taskforce
Just to set the record straight on 4x4 frames: K/10 Long bed and K/20 share the same frame. Short bed K/10 and K/5 are different frames from each other and obviously the long bed trucks. The short K/10 and K/5 both are lighter duty than the long bed K frame.
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Agree and in fact the 4x2 C10-20 have slightly stiffer frames than the 4x4 K10-20.
The frame section and modulus numbers, 39k psi carbon steel through C30s. Note the increased section height, flange width and thickness changes of the frame as the series step up.
C Blazer
C10 115"
C10 127"- 6.04" section height, 2.53" flange width, 0.156" thick, 2.98 section modulus
C20 127"- 6.11" section height, 2.46" flange width, 0.194" thick, 3.71 section modulus
C20/30 133" (Longhorns)- 7.20" section height, 2.77" flange width, 0.194" thick, 5.05 section modulus
K Blazer
K10 115"- 6.02" section height, 2.71" flange width, 0.141" thick, 2.70 section modulus
K10 127"
K20 127"- 6.09" section height, 2.75" flange width, 0.186" thick, 3.48 section modulus
Referenced from the GM 1970 truck engineering specifications book.