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70 rear bumper bracket question

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Old Aug 15, 2015 | 05:53 PM
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Default 70 rear bumper bracket question

Ok, I am just beginning to work on my new project, a 70 Vette 4 speed with t top. The previous owner had it 10 years and was restoring it. The entire drive train has been rebuilt, so the hard work is done That owner told me he had put a new frame underneath. I'm not sure it is an original 70 frame. One reason I say this is that I had to work to get the gas tank cap to line up. A second reason is that at the very end of the frame, in the rear, there looks to be some kind of an attachment plate on either side. A third reason is that, as I go to attach the bumper brackets, nothing seems right. Talk to me. What do you think? I have always been a Ford/Dodge guy, so this is my first restoration venture into Chevy, so I'm sure I will spend some time on this forum. Anyway, we are talking genuine American cars, not the foreign junk!
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Old Aug 15, 2015 | 06:33 PM
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Honestly....you need to purchase a AIM ( Assembly Instruction Manual).

The only way i can help is VERY GOOD photo's.

DUB
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Old Aug 15, 2015 | 09:15 PM
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Originally Posted by Rev Ron
Ok, I am just beginning to work on my new project, a 70 Vette 4 speed with t top. The previous owner had it 10 years and was restoring it. The entire drive train has been rebuilt, so the hard work is done That owner told me he had put a new frame underneath. I'm not sure it is an original 70 frame. One reason I say this is that I had to work to get the gas tank cap to line up. A second reason is that at the very end of the frame, in the rear, there looks to be some kind of an attachment plate on either side. A third reason is that, as I go to attach the bumper brackets, nothing seems right. Talk to me. What do you think? I have always been a Ford/Dodge guy, so this is my first restoration venture into Chevy, so I'm sure I will spend some time on this forum. Anyway, we are talking genuine American cars, not the foreign junk!
Just provide some more specific details for each problem you are encountering. What do you mean by "new frame?" If you have a genuine "new frame" from GM parts for an early C3, bought after 1973, GM parts would ship you a new 1973 frame for a substitute for a 68 through 72 frame. The 73 frame could be easily converted for a 68 to 72 by some minor drilling/welding that would be no problem for a body shop. But for an individual, a 73 frame is not a simple just bolt on matter for a 68 to 72 application.

My 1970 project car is now using new GM parts catalog frame purchased in 1980. I ordered a 1970 frame from GM parts in 1980. It was only recently that I discovered that my "1970" frame delivered from my GM parts order, is actually a 1973. They never told me my 1970 ordered frame would be delivered as a 1973 frame.

Last edited by 68/70Vette; Aug 15, 2015 at 09:20 PM.
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Old Aug 16, 2015 | 07:22 AM
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Hi RR,
The rear of the 68-73 frame has a certain configuration to enable the bumper brackets to be attached to the ends of the rails and the rear crossmember.
This configuration changed once the type of rear bumpers being used changed in 1974.
Here's the typical 68-72 frame rail configuration.
Regards,
Alan

Left Side


Right Side
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Old Aug 16, 2015 | 08:40 AM
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Originally Posted by Rev Ron
...I'm not sure it is an original 70 frame...What do you think?...
I think it would help you a lot if you knew what the PO put under the car. Can you contact the PO to determine what year frame you're trying to work with?
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Old Aug 16, 2015 | 09:04 AM
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Alan
I curse you! A Pox on your home! May the Witches of the Netherlands plague you!
No car should be that clean and neat!!
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Old Aug 16, 2015 | 03:04 PM
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Hi jnb,
It's the result of a mental illness with no hope of a cure!
Regards,
Alan
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Old Aug 16, 2015 | 04:45 PM
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Originally Posted by jnb5101
No car should be that clean and neat!!
I`d bet BIG money that there`s not one square inch of Alan`s car that isn`t perfect! I`m amazed EVERY SINGLE TIME he posts pictures of it!
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Old Aug 16, 2015 | 08:06 PM
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Originally Posted by Rev Ron
That owner told me he had put a new frame underneath. I'm not sure it is an original 70 frame. A second reason is that at the very end of the frame, in the rear, there looks to be some kind of an attachment plate on either side. A third reason is that, as I go to attach the bumper brackets, nothing seems right.
Sounds like the frame may be from a 74 or later, crash bumpers in the rear? Can you post some photos?
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Old Aug 17, 2015 | 05:06 PM
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the rear of your frame should look like this, (very back cross support)
if not you will not be able to mount up chrome bumpers,
in addition there are 3-4 different bumper support brackets for each side,
in addition to the bare frame you see.

Last edited by 69Vett; Aug 17, 2015 at 05:08 PM.
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