c3 frames
Pro
Joined: Apr 2004
Posts: 687
Likes: 0
From: Atascadero Ca
4 speed frame = automatic frame with a small tab welded on to it for the clutch linkage and a welded in non-removable transmission crossmember. As far as years are concerned, I'd wait for someone who knows more than I to post about this, but I believe the frames are the same for all the c3's. Certainly 68-77 must be the same.
Pro
Joined: Sep 2002
Posts: 653
Likes: 0
From: Dickinson (Houston) Texas
If you do find an automatic frame you can get the Clutch Pivot Bracket from Zip to weld on the frame. Zip's part # is CL-205 for the bracket.
www.bigdogvettes.com
www.bigdogvettes.com
Race Director
Joined: Apr 1999
Posts: 10,860
Likes: 709
From: Beverly Hills/Pine Ridge Florida
You'll find differences in the rear with a rubber bumper shark frame as compared to a 69 frame. Same deal up front with the frame horns.
There are also various gussets that are different. I'd look for a correct frame. Chuck
There are also various gussets that are different. I'd look for a correct frame. Chuck
Team Owner
Joined: Aug 2000
Posts: 21,415
Likes: 451
From: Massillon,Ohio USA
2020 C3 of the Year Finalist - Unmodified
Cruise-In VI Veteran
St. Jude Donor '08-'09-'10-'11-'12
As far as I can physically tell, '68-'74 are the same. The '75 & on up is where the back end of the frame changed drastically for the "hydraulic bumper shocks", which '74 did NOT have. My '68s & my '74 look identical back there, except a '74's rear bumper absorbed shock through a "sliding" mechanism that was on each side of the rear of the frame. This you would remove for use on a pre-'74 car. Now there may be an extra hole or two here and there for this "sliding mechanism", but it looks the same as my '68s. '68 frames also did not have the "angular" gussets between the main rear lower perimeter crossmember and the doglegs(kick-ups)over the trailing arms. This applies to almost all '68 frames. Very late '68s(last couple thousand)DID HAVE these angular "gussets".
