Swapping to convertible frame ? - Chevelle Tech
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post #1 of 24 (permalink) Old Sep 19th, 16, 9:58 AM Thread Starter
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Swapping to convertible frame ?

I'm considering swapping my 69 hardtop frame for a convertible frame, is anyone aware of any problems that I might run into as far as fitment goes? Thanks for any help you can offer.
Mike
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post #2 of 24 (permalink) Old Sep 19th, 16, 10:41 AM
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Re: Swapping to convertible frame ?

Seems like a direct fit - I believe. Convertible frame is boxed vs. 2 door hardtopis not.
this page may help:
https://www.chevelles.com/forums/42-c...frame-q-2.html

Chevelle Frames

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post #3 of 24 (permalink) Old Sep 19th, 16, 10:48 AM Thread Starter
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Re: Swapping to convertible frame ?

Bob, thanks for the reply, and the link, it looks to have a lot of information. Much appreciated.
Mike
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post #4 of 24 (permalink) Old Sep 19th, 16, 1:45 PM
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Re: Swapping to convertible frame ?

There are no issues as far as interchangeability goes but to be honest, it's kind of a waste of time and resources to do it.

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post #5 of 24 (permalink) Old Sep 19th, 16, 2:18 PM Thread Starter
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Re: Swapping to convertible frame ?

Tom, you're probably right. I had thought about boxing the frame of my car with one of the kits from ABC Performance to start with, but my frame needs some work. I thought if I could find a convertible frame in good shape I could just blast it, paint it, and bolt it in.
Mike
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post #6 of 24 (permalink) Old Sep 19th, 16, 4:19 PM
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Re: Swapping to convertible frame ?

brake and fuel lines are different, trans crossmember too, maybe not a big deal though.

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post #7 of 24 (permalink) Old Sep 20th, 16, 10:38 PM
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Re: Swapping to convertible frame ?

Quote:
Originally Posted by M.Maner View Post
Tom, you're probably right. I had thought about boxing the frame of my car with one of the kits from ABC Performance to start with, but my frame needs some work. I thought if I could find a convertible frame in good shape I could just blast it, paint it, and bolt it in.
Mike
Mike,

If your frame is in not so good shape, I would look for another coupe frame and close it in if that is what you want to do. Just be aware you will have to tweak the brake and fuel lines. A convertible frame, at least around here, is in the $1500+ range if you can find one. Coupe frames are all over the place for much less.
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post #8 of 24 (permalink) Old Sep 21st, 16, 8:36 AM
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Re: Swapping to convertible frame ?

may just be my imagination after owning chevelles pretty much since I have been driving - but since I got an el camino that has a full box frame - seems like it rides a bit better on the road. I say go for it but curious what the weight difference is between the two. If you are a go faster guy them you may leave a little on the table.
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post #9 of 24 (permalink) Old Sep 23rd, 16, 5:34 PM
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Like Tom says above. Cheaper to get coupe and box it. I actually had to do that when I needed one as I couldn't find one under 2k. I used eighth inch platex3 inch I think. Then added 2x4 on top of that. Adds about 100 pounds. Have you found a very frame yet? Hard to get around me.
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post #10 of 24 (permalink) Old Sep 23rd, 16, 7:04 PM
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Re: Swapping to convertible frame ?

Quote:
Originally Posted by the heckler View Post
may just be my imagination after owning chevelles pretty much since I have been driving - but since I got an el camino that has a full box frame - seems like it rides a bit better on the road. I say go for it but curious what the weight difference is between the two. If you are a go faster guy them you may leave a little on the table.
Have you considered it is the longer wheelbase of the EC contributing to your impressions. BTW I own both. Considering the '65 Z16 had a convertible frame and an LS6 did not indicates that GM saw no need/value in it.
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post #11 of 24 (permalink) Old Sep 28th, 16, 1:17 AM
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Re: Swapping to convertible frame ?

Convertible cross members are almost 10" shorter than the coupes so if you swap try and get the cross member too or you'll be paying a premium for a new one.

The G force cross member from Summit was the best deal I found, not very much more than a factory unit but a LOT stouter. Must weigh about 20 pounds though.

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post #12 of 24 (permalink) Old Sep 28th, 16, 10:40 AM
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Re: Swapping to convertible frame ?

I needed another frame for my 67 convertible last year and there was nothing out there, even looking for an El Camino frame too. I looked for months. Unless you knew of one available, it definitely seems like harder route to go

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post #13 of 24 (permalink) Old Sep 28th, 16, 8:47 PM
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Re: Swapping to convertible frame ?

Quote:
Originally Posted by zookpr View Post
Considering the '65 Z16 had a convertible frame and an LS6 did not indicates that GM saw no need/value in it.
... and then again, in 1970 Pontiac Motor Division offered a Heavy Duty (i.e. boxed) Frame as an option in the (400 CID) GTO and the HD Frame was standard with the "torque monster" 455 HO. Just because Chevy didn't think one was necessary...

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post #14 of 24 (permalink) Old Sep 29th, 16, 5:26 AM
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Re: Swapping to convertible frame ?

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Originally Posted by NickeyChevelle View Post
... and then again, in 1970 Pontiac Motor Division offered a Heavy Duty (i.e. boxed) Frame as an option in the (400 CID) GTO and the HD Frame was standard with the "torque monster" 455 HO. Just because Chevy didn't think one was necessary...
I recently got beat up here for talking about more than Chevelles in a response a discussion about the Malibu on eBay with round pod dash, but NO gage package, and in response to a specific post I made a reference to other A-bodies (Monte Carlo & El Camino) with some direct examples. I was told to "stick to Chevelles"! So lets stick to Chevelles here too. Who cares about what the sister divisions did, only the what the Chevrolet Chevelle line did.
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post #15 of 24 (permalink) Old Sep 29th, 16, 9:31 AM Thread Starter
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Re: Swapping to convertible frame ?

I wanted to thank everyone for the information, and opinions. It looks like I will probably have to stick with the hardtop frame, and box it in. I do appreciate all of the help.
Mike
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