70 frame
Team Owner
Joined: Sep 2006
Posts: 31,037
Likes: 4,082
From: Westminster Maryland
Hi c,
You can use the 73 frame.
The difference will be in the height of the body mounts…the 73 frame is set up for rubber body mount bushings while the 68-72 frames used an aluminum 'puck' as a bushing. The mounts were lowered about 3/8" for 73. This won't be a problem.
Remember that 4-speed frames had the transmission crossmember welded in place but the automatic frames crossmember was bolted in place.
Regards,
Alan
Check this link.
http://www.71corvette.com/frames.html
You can use the 73 frame.
The difference will be in the height of the body mounts…the 73 frame is set up for rubber body mount bushings while the 68-72 frames used an aluminum 'puck' as a bushing. The mounts were lowered about 3/8" for 73. This won't be a problem.
Remember that 4-speed frames had the transmission crossmember welded in place but the automatic frames crossmember was bolted in place.
Regards,
Alan
Check this link.
http://www.71corvette.com/frames.html
Last edited by Alan 71; Sep 14, 2016 at 02:58 PM.
Thread Starter
Instructor
Joined: Jun 2013
Posts: 189
Likes: 6
From: van buren arkansas
Hi c,
You can use the 73 frame.
The difference will be in the height of the body mounts…the 73 frame is set up for rubber body mont bushings while the 68-72 frames used an aluminum 'puck' as a bushing. The mounts were lowered about 3/8" for 73. This won't be a problem.
Remember that 4-speed frames had the transmission crossmember welded in place but the automatic frames crossmember was bolted in place.
Regards,
Alan
Check this link.
http://www.71corvette.com/frames.html
You can use the 73 frame.
The difference will be in the height of the body mounts…the 73 frame is set up for rubber body mont bushings while the 68-72 frames used an aluminum 'puck' as a bushing. The mounts were lowered about 3/8" for 73. This won't be a problem.
Remember that 4-speed frames had the transmission crossmember welded in place but the automatic frames crossmember was bolted in place.
Regards,
Alan
Check this link.
http://www.71corvette.com/frames.html
So would you just use the rubber body mounts for a 73 or would you lower the brackets or shim and use aluminum pucks?
Also would the front bumper brackets be a problem?
Team Owner
Joined: Sep 2006
Posts: 31,037
Likes: 4,082
From: Westminster Maryland
Hi c,
I'm always interested in originality so I'd figure out a way to use the aluminum 'pucks'. I don't think I'd go through the work of changing all 8 mounts though. I'd look to see if I could make it appear to have what a person would see when looking at a 70 frame.
Many folks would say that's silly because the rubber bushing gives a more cushioned ride. So they'd install the rubber bushings and be done with it.
Regards,
Alan
I'm always interested in originality so I'd figure out a way to use the aluminum 'pucks'. I don't think I'd go through the work of changing all 8 mounts though. I'd look to see if I could make it appear to have what a person would see when looking at a 70 frame.
Many folks would say that's silly because the rubber bushing gives a more cushioned ride. So they'd install the rubber bushings and be done with it.
Regards,
Alan
Thread Starter
Instructor
Joined: Jun 2013
Posts: 189
Likes: 6
From: van buren arkansas
Hi c,
I'm always interested in originality so I'd figure out a way to use the aluminum 'pucks'. I don't think I'd go through the work of changing all 8 mounts though. I'd look to see if I could make it appear to have what a person would see when looking at a 70 frame.
Many folks would say that's silly because the rubber bushing gives a more cushioned ride. So they'd install the rubber bushings and be done with it.
Regards,
Alan
I'm always interested in originality so I'd figure out a way to use the aluminum 'pucks'. I don't think I'd go through the work of changing all 8 mounts though. I'd look to see if I could make it appear to have what a person would see when looking at a 70 frame.
Many folks would say that's silly because the rubber bushing gives a more cushioned ride. So they'd install the rubber bushings and be done with it.
Regards,
Alan
I was just wondering if the rubber bushings gave a better ride then why change out the bushings from the c2 that had the bushings to the early c3 didn't! The bushings clearly looked worn on my c2.
Team Owner
Joined: Sep 2006
Posts: 31,037
Likes: 4,082
From: Westminster Maryland
Hi c,
There's got to be some 'softer' ride with the rubber mounts.
They both deteriorate though… the aluminum oxidize and the rubber deteriorates.
As I said it really depends on how accurate you want to be as to which you chose.
Regards,
Alan
There's got to be some 'softer' ride with the rubber mounts.
They both deteriorate though… the aluminum oxidize and the rubber deteriorates.
As I said it really depends on how accurate you want to be as to which you chose.
Regards,
Alan
Thread Starter
Instructor
Joined: Jun 2013
Posts: 189
Likes: 6
From: van buren arkansas
Hi, Alan
i found a 79 frame ! I saw the link and i was a little confused about using the 79 frame. So if i just cut off the rear bumper support and weld on my old one, and the lower body mounts, should the 79 frame work?
Check this link.
http://www.71corvette.com/frames.html[/QUOTE]
i found a 79 frame ! I saw the link and i was a little confused about using the 79 frame. So if i just cut off the rear bumper support and weld on my old one, and the lower body mounts, should the 79 frame work?
Check this link.
http://www.71corvette.com/frames.html[/QUOTE]
Team Owner
Joined: Sep 2006
Posts: 31,037
Likes: 4,082
From: Westminster Maryland
Hi C,
It looks to me like the rear 12-18" of each frame rail, along with the tank mount bracket, changed along with the rear crossmember.
I'm unsure how the front frame extensions changed as the rubber bumpe design progressed.
What caliber of a 70 are you working on. I ask only because on certain cars a modified frame might raise some eyebrows.
Regards,
Alan
It looks to me like the rear 12-18" of each frame rail, along with the tank mount bracket, changed along with the rear crossmember.
I'm unsure how the front frame extensions changed as the rubber bumpe design progressed.
What caliber of a 70 are you working on. I ask only because on certain cars a modified frame might raise some eyebrows.
Regards,
Alan
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Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,753
From: Charlotte NC
I agree...it is NOT just the rear bumper support on the frame.
Not to mention that the brake proportion valve for a 1979 has a bracket welded to the frame. And not knowing what type of brake system...it may require you drilling some holes for your brake lines to be secured.
DUB
Not to mention that the brake proportion valve for a 1979 has a bracket welded to the frame. And not knowing what type of brake system...it may require you drilling some holes for your brake lines to be secured.
DUB
Thread Starter
Instructor
Joined: Jun 2013
Posts: 189
Likes: 6
From: van buren arkansas
I agree...it is NOT just the rear bumper support on the frame.
Not to mention that the brake proportion valve for a 1979 has a bracket welded to the frame. And not knowing what type of brake system...it may require you drilling some holes for your brake lines to be secured.
DUB
Not to mention that the brake proportion valve for a 1979 has a bracket welded to the frame. And not knowing what type of brake system...it may require you drilling some holes for your brake lines to be secured.
DUB