C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Cracked Frames and Coilovers 87 Convertible

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Old Aug 15, 2017 | 04:40 PM
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Default Cracked Frames and Coilovers 87 Convertible

I picked up an LS-1 from an 04 GTO and want to go to coil overs on my 87 convertible. I've read about the frames of these cars cracking with the addition of coil overs and Van Steel says the frames need to be modified on cars made prior to 1988.
I've spent my morning searching for details but have had no success. Does anyone here have knowledge about the necessary modifications or failure mode or links to any information regarding this issue?
I would appreciate any information on this subject.
Thank you
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Old Aug 16, 2017 | 12:01 AM
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Frames cracking from coil-overs? First I've heard of this.
Maybe that the rear knuckles need reinforcement.
And there is a cross brace to help stiffen the chassis on verts.

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Old Aug 16, 2017 | 08:45 AM
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Pretty sure he's referring to the upper shock mounts on the front
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Old Aug 16, 2017 | 09:09 AM
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LD85's front mounts - he mentions earlier in the thread I believe that he might change the upper mount choice if he were to do it again. This is only for the fronts.

https://www.corvetteforum.com/forums...post1591972315

For the rears there's been discussions of spindle supports and various issues with mounts and vendors. I'll leave that alone.
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Old Aug 16, 2017 | 04:14 PM
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Originally Posted by WVZR-1
LD85's front mounts - he mentions earlier in the thread I believe that he might change the upper mount choice if he were to do it again. This is only for the fronts.

https://www.corvetteforum.com/forums...post1591972315

For the rears there's been discussions of spindle supports and various issues with mounts and vendors. I'll leave that alone.
This is very helpful, a lot of good information.
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Old Aug 17, 2017 | 07:01 PM
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The rubber bushings would split after not long, I would go with the Eye bolt Clevis type setup "IF" id did it again

Last edited by LD85; Aug 17, 2017 at 07:05 PM.
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