[3macs1]

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What are the main difference in 1968-1972 A-body frames compared to the 1969 Chevelle frame. I'm looking for a complete 1969 Chevelle frame and am trying to figure out which frames are identical. Thanks in advance.

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When I first seen this post I thought we were talking about something totally different vs just what frame will fit a 69 Chevelle.
What I mean is for a 65-70 Chevrolet B body for example GM used three different frame manufacturers and each used different materials for construction which produced different section modulus and different strengths.
For example a AO Smith Frame used 2 piece channel rails
BUDD Frame 1 piece channel rail frame
FLINT Frame 1 piece tube rail frame
After you get to look at each in detail you know what to look for to ID each manufacturer and BUDD by far was the strongest design for the B body.
I have not been able to prove this on the US side but I have never seen an Canadian documented big block car that didnot have a BUDD frame and have used this a few times to ID a potential clone. Yes I have seen 6 cylinder cars in Canada also with BUDD but if an AO is seen on a BBC every time the car proved later to be a rebody,clone or the frame was replaced.GM also talks about this in early technical literature and there is reference to the three designs in the parts manuals.
Just wondering if anyone has looked at this for Chevelles also and if there is any link to a frame manufacturer, a particular design and a true SS or factory installed BBC.