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

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Old Jul 20, 2009 | 09:53 PM
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Default Solid rear

I know that there are kits out there and this post isn't designed to lowball anyone at all, but rather find out information to help me discuss this matter in regards to replacing the IRS with a solid rear.

What are the obstacles / costs / fabrication required when replacing the IRS and switching to a solid rear? I know geometry and angles will come into play and I don't think it's as simple as unbolting the IRS and simply bolting a solid rear (9" or 12 bolt).

My brother (Mustang owner) said "I don't know why you just don't throw a 9 " in it and not worry about busting half shafts and spindles". I told him it wasn't that simple and although I know of people who would have 9 " rear ends around for low money, that a lot more money would be required.

Care to let me know about these other obstacles / costs / fabrications?
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Old Jul 20, 2009 | 10:00 PM
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Swapping in a solid rear is relatively easy.Depends how elaborate you want to go
Make new trailing arm mounting brackets for the front of the 4 link to replace factory ones , like the Carrolls setup in link below , make some top shock mounts for the coilovers .
http://i259.photobucket.com/albums/h...cecraft004.jpg

Problem area is what are going to use to hold up the back of the trans once the C beam is gone?

Last edited by rodj; Jul 20, 2009 at 10:04 PM.
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Old Jul 20, 2009 | 10:19 PM
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im doing this swap myself,and i think ive got the crossmember thing figured out.other than that exhaust,the reluctor ring for the abs if yours has that,bracket for the brake calipers,and thats about it.my trailing arm brackets were made by blowing up a picture of someone elses design till the bolt holes in the picture were actual size.i dont think ill be able to carry a spare afterwards,but im going to try to make that work too.i got lucky and bought a friends partially done solid swap project for 200 bucks.when its all said and done ill have 2000 or less in it.
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Old Jul 21, 2009 | 10:58 AM
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Here is the link to the build up of my solid rear, lots of pics:

http://forums.corvetteforum.com/c4-t...cs-inside.html
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Old Jul 21, 2009 | 11:21 AM
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jerry, give me a call.
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Old Jul 21, 2009 | 11:49 AM
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Rick, I can honestly say I have lost your number. Gotta give it to me again mang.
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Old Jul 21, 2009 | 01:12 PM
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i sent it to you..
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Old Jul 21, 2009 | 01:24 PM
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you two; get a room.
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Old Jul 21, 2009 | 02:26 PM
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Originally Posted by BIRDMANmx5
you two; get a room.
don't be jealous......
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Old Jul 21, 2009 | 02:47 PM
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We almost held hands here, we were soooo close.
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Old Jul 21, 2009 | 03:50 PM
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Originally Posted by black_89_vette
I know that there are kits out there and this post isn't designed to lowball anyone at all, but rather find out information to help me discuss this matter in regards to replacing the IRS with a solid rear.

What are the obstacles / costs / fabrication required when replacing the IRS and switching to a solid rear? I know geometry and angles will come into play and I don't think it's as simple as unbolting the IRS and simply bolting a solid rear (9" or 12 bolt).

My brother (Mustang owner) said "I don't know why you just don't throw a 9 " in it and not worry about busting half shafts and spindles". I told him it wasn't that simple and although I know of people who would have 9 " rear ends around for low money, that a lot more money would be required.

Care to let me know about these other obstacles / costs / fabrications?


did you tell him that a corvette can turn a corner unlike his mustang.

jerry, think hard about the solid rear end as i see some mosport in your future next year. it's alot more enjoyable then going straight, and doesnt put the D44 in the hurt locker.
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Old Jul 21, 2009 | 05:26 PM
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Rick, this was just a shot at finding information so I can tell my brother that "just dropping in a 9 inch and be done with it" is more complicated than it sounds.

I am staying with my IRS for a bit.
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