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Corvertible X-Brace

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Old Nov 11, 2009 | 03:55 PM
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Default Corvertible X-Brace

Hi All
Long time C-4 owner. Just got my first C-4 convertible. As I was under it, changing fluids and gas filter, I noticed that the large x-shaped brace under my car does not attach in the middle of the X, just at the 4-corners (one covers the fuel filter).
Should it bolt to the car in the middle of the X, too?
Need an expert! Thanks.
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Old Nov 11, 2009 | 04:07 PM
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Originally Posted by Clark Bente
Hi All
Long time C-4 owner. Just got my first C-4 convertible. As I was under it, changing fluids and gas filter, I noticed that the large x-shaped brace under my car does not attach in the middle of the X, just at the 4-corners (one covers the fuel filter).
Should it bolt to the car in the middle of the X, too?
Need an expert! Thanks.
No.

And all there is in the middle is the transmission pan.
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Old Nov 11, 2009 | 04:09 PM
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Mine has 2 big bolts in each of the 4 corners going in to aluminum blocks, and it has I believe at lest 2 in each beam of the X. So total I think I have

A minimum of 16 bolts holding mine in.
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Old Nov 11, 2009 | 04:12 PM
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Thanks, 80's Rule and Polo Green 1

Just to be safe, could I drill into the trans and use plastic anchors or Tapcons?
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Old Nov 11, 2009 | 04:22 PM
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Why? you need the 4 corners and 2 along each piece of the X that holds it plenty tight to the car. nothing goes in the direct center of it.
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Old Nov 11, 2009 | 06:08 PM
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Originally Posted by Clark Bente
Thanks, 80's Rule and Polo Green 1

Just to be safe, could I drill into the trans and use plastic anchors or Tapcons?
Considering the amount of engineering that GM placed in the C4 Vette, do you have a problem or analysis that trumps the existing design? By the way, my '86 has 20 fasteners; 4 bolts at each end of the X-frame into the side rails and 2 nuts onto studs in each back leg that hold the frame against the floor pan (4 nuts total). By the way, why do you think plastic anchors would provide any sort of structural rigidity?

Steve
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Old Nov 11, 2009 | 06:34 PM
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azrocketman good thing you know, I knew it was a lot.
To the op if you are missing some you should get them in for the full benefits of it.
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Old Nov 11, 2009 | 07:15 PM
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Originally Posted by Clark Bente
Just to be safe, could I drill into the trans and use plastic anchors or Tapcons?
Clark, I think you've hooked two - so far!
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Old Nov 11, 2009 | 11:46 PM
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Originally Posted by RUU
Clark, I think you've hooked two - so far!
Yup, I think by the question he asked and some of the ideas that float on around here, and some of the things done to used cars, nothing surprises me.
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Old Nov 12, 2009 | 12:15 AM
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Originally Posted by Clark Bente
Thanks, 80's Rule and Polo Green 1

Just to be safe, could I drill into the trans and use plastic anchors or Tapcons?
Yeah, I think mid-america sells a combination drain-plug, x-brace anchor thingie that's exactly what you're talking about.
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Old Nov 12, 2009 | 06:17 PM
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Thanks, all.
I really wanted to know about the x-brace. I just got the car, and haven't had it on 4 jackstands yet, only 2 so I couldn't get under there yet. I was wondering wtf on the x-brace.
Next job, new fluid in clutch and brakes. I'll be all the way under next time, and wanted to know if I had a problem with the x-brace or not before I got there.
I was happy to get my answer back so quickly from a couple of experts. I thought my dumb comment on the end of my "thank you" response was so stupid and funny that they would get a chuckle.

Last edited by Clark Bente; Nov 12, 2009 at 06:22 PM.
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Old Nov 14, 2009 | 11:35 AM
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the x brace must be connected TO ITSELF at the center to function structurally...tying x-brace to the floorpan might reduce potential for noise generation but the floorpan itself is too flexible to add any substantive strength to the assy
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Old Nov 14, 2009 | 11:42 AM
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I worked on a 94 convertible that creaked when driven out of a driveway at an angle. Owner had already had a rebuilt steering rack installed thinking that was the problem. I torqued the 8 corner bolts a few #-' over the factory spec and the creak went away - a word to the wise.
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