Frame rails

[Slammed84]

Originally Posted by crashz

I don't think so.

There was a great post with a GM frame chart here, but I can't find it. Anyway it related GVWR and series with bending moment. There was a lot of factors, but mostly relating to section modulus, and for those series (as dimensions are basically the same for long bed rails) the thickness of the steel was the difference. There was some crossover, but very little. IE- its possible that a heavy 1/2 frame rail would be the same as a light duty 3/4 rail, but it would need to be referenced by serial number.

So is that what a heavy half is? Just a beefier frame but 1/2 ton suspension? What is the Big 10?

[Keith Seymore]

Originally Posted by Slammed84

So is that what a heavy half is? Just a beefier frame but 1/2 ton suspension? What is the Big 10?

Other way around.

Big 10/Heavy Half use the 1/2 ton frame but get heavier duty springs/leaf spring packs.

K