Getting ready to start my 70 Skylark restoration and rather than re-repair the horn and front frame damage that was not properly done by the previous owner, I'm getting a replacement frame. I was wondering if anyone new if there was a reason for the two designs of the "A" body frame. Is B better than A?? The differences appear to only be in the rear rail area going over the axles and the cross member there. I have not been able to find any info on the net. Thanks
Well now I'm curious. Does no reply to my question mean that "its a ridiculous question" or "that no one simply knows"?
as far as I know any A body frame will work 68-72 There are 2 frames small block and big block in a Buick
I have never heard of what you are talking about. There may be minor differences I would think. Never heard of that either. There are frame braces between the upper and lower rear control arm attachment points at the frame. There are also the cross braces in the radiator support. Small block and big block steering shafts where they attach to the steering box are different. Think the frames are the same otherwise. http://www.pbase.com/pontiac_performance/gm_a_body_frame_chassis http://www.artmorrison.com/chevelle.php
The A body bb has thicker metal in the front engine cradle sb is a bit thinner the frame also has a different number on it.
Maybe he means the boxed frames for the convertibles? Interesting article: 1970-1972 GM A Body Frame Swapping Guide :Comp:
Thanks for the article, that is useful info. I will try and take a picture of the differences I'm speaking of and post them tonight. thanks again.
yeah larry Duane clued me into this and I sold a GS 455 frame ot a member he did not believe it until he put a mic on both. The BB Buick frame is thicker on the front section only but as mentioned it has a different part number and as per Buick it needed the extra thickness for the torque of the 455 It could have been thicker if you ask me. Ever wonder why sdo many original grilles just cracked? My opinion its torsional twist that destroyed many original grilles the core support bars are just a band aid they help but not enough.
Makes sense, like I always say, I learn something new on V8 everyday. Now the question is, which is Frame Type A and which is Frame Type B.
instead of A or B the right terms would be early and late 68 is unique but is basically the same as 69-70 69 and 70 are the same and 71-72 are the same 68 has a welded on skid plate in the front cross member..looks like an arrow head and i get these two mixed up but either 69-70 the frame at the rear where it kicks up for the rear is either smooth or stepped.. on the side..you can see it by looking in the 1/4 panel wheel house...its obvious theres no real diff..and theres nor real advantage to either...if you want correct you look for the correct version.. as far as the 455 frame being thicker..they say the exact same about 64 GTO frames...and i have cut them in half and they dont realy mic out diff..so i know theres a specific part number for the BB frame..i dont believe theres much diff..
I have been told before by several reputable Buick and GM musclecar "experts" that the '70-'72 Buick BB convertible is the strongest A-body frame .... that makes sense now.
Here are the pictures of the difference between frames. Looks like Mark is correct. The frame on the left (A/EARLY) that still needs cleaning up is from a 70 Skylark and is the same as the one on my 70. The other frame (B/LATE) is from a 71. From an engineering standpoint it appears to me that the B/LATE was redesigned to transfer the torque a bit more efficiently. In any case, if there is no advantage between the two I guess I'll stick with the A since my only plans are to cruise and enjoy, no racing. I guess I'll finish with the prepping and painting on the B and sell it. Thanks to all, Jake
