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71 frame condition question

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Old Jul 15, 2016 | 09:14 AM
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Default 71 frame condition question

71' Convertible

I'm starting to get my 13yr old son involved in working on the "old car", and that got me to really... really look at the contact points from my jack stands to the frame.

I know the old C3 frames aren't perfect, but from the factory how flat should they be on the bottom?

does anyone have any pictures of "Good" frames? I'll try to get a pic of mine up here tomorrow.

I'm mostly worried that the jack stand doesn't make great contact in many locations.


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Old Jul 15, 2016 | 09:34 AM
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Hi A,
I'm not sure what you mean by "flat"?
I worked on my frame in my garage which has a more or less 'level' concrete floor and used 4 jack stands to support it in many different locations.
I don't think I ever had an occasion when the stands were place symmetrically and the frame would 'rock' on the them.
The frame rails are indeed 2 sections welded together that result in a 'stepped' bottom surface, but places can still be easily found to locate the jack stands.
I often place the rear set of stands at the triangular 'fillet' at the step up of the frame rail for the t-arms.
Sometimes I'd use 6 stands which would allow me to remove 1 at the location on the frame I was currently working on.
Here's an example of a typical 4 jack stand placement.
Regards,
Alan


Last edited by Alan 71; Jul 15, 2016 at 09:39 AM.
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Old Jul 15, 2016 | 10:38 AM
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Does this look normal to you?




Originally Posted by Alan 71
Hi A,
I'm not sure what you mean by "flat"?
I worked on my frame in my garage which has a more or less 'level' concrete floor and used 4 jack stands to support it in many different locations.
I don't think I ever had an occasion when the stands were place symmetrically and the frame would 'rock' on the them.
The frame rails are indeed 2 sections welded together that result in a 'stepped' bottom surface, but places can still be easily found to locate the jack stands.

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Old Jul 15, 2016 | 11:01 AM
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Hi A,
The dent? No.
The sloped bottom of the rail? Yes.
regards,
Alan

Same area but with a 'welded in' transmission cross member which was used with 4-speed transmissions. The 'bolt in' crossmember was used with automatic transmissions.

Last edited by Alan 71; Jul 15, 2016 at 11:05 AM.
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Old Jul 17, 2016 | 11:11 PM
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Originally Posted by Alan 71
Hi A,
The dent? No.
The sloped bottom of the rail? Yes.
regards,
Alan

Same area but with a 'welded in' transmission cross member which was used with 4-speed transmissions. The 'bolt in' crossmember was used with automatic transmissions.
Alan, your c3 frame is spotless, very nice!!
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Old Jul 18, 2016 | 12:14 AM
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Originally Posted by Alan 71
Hi A,
The dent? No.
The sloped bottom of the rail? Yes.
regards,
Alan

Same area but with a 'welded in' transmission cross member which was used with 4-speed transmissions. The 'bolt in' crossmember was used with automatic transmissions.
Hi Alan-What type of paint/powder-coat did you use to get this type of finish on your frame?

Thanks, once more.
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Old Jul 18, 2016 | 06:34 AM
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Hi drs,
I stripped the frame myself using wire-wheels, etc.
I then had it powder coated semi-flat black.
I sanded the entire powder coating surface and painted it with Krylon #1613 to get just the appearance I wanted.
Regards,
Alan

The nice thing about Krylon #1613 is that you vary the amount of gloss you get by varying how you spray it since it's lacquer.

Last edited by Alan 71; Jul 18, 2016 at 06:38 AM.
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Old Jul 18, 2016 | 02:40 PM
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Yes Alan does nice work. I am always amused at the "quality" of welds on older car frames, and yet they hold up in most cases just fine.
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Old Jul 18, 2016 | 03:35 PM
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Everyone wants that nice flat steel frame rail but unfortunately over the years knuckleheads including myself just took a floor Jack and placed it anywhere along the frame. Causing dents, ripples and a really crappy looking frame rail. The good news is no structural problems has ever resulted from this. Enjoy your project. I'm sure many of us are jealous of your son

Carefully use a board or a floor Jack puck and try to place the jack in the corners by the wheel to avoid denting .

Last edited by hugie82; Jul 18, 2016 at 03:37 PM.
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Old Jul 18, 2016 | 05:16 PM
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Originally Posted by Abbacabba
71' Convertible

I'm starting to get my 13yr old son involved in working on the "old car", and that got me to really... really look at the contact points from my jack stands to the frame.

I know the old C3 frames aren't perfect, but from the factory how flat should they be on the bottom?

does anyone have any pictures of "Good" frames? I'll try to get a pic of mine up here tomorrow.

I'm mostly worried that the jack stand doesn't make great contact in many locations.


--
Jack stands should be in 6 locations to start with .I have a 68 and 70 frames in restoration progress that you and son are welcome to come view anytime .I am by Lexington Kentucky.
Wes



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