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Independent Rear Suspension?

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Old Dec 20, 2010 | 12:42 AM
  #1  
LS61990RS's Avatar
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Independent Rear Suspension?

I'm wanting to get independent rear suspension. Will a C4 or a C5 rear axle swap over to the third gen, if so, what all would i need for this swap.

Thanks, Ryan.
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Old Dec 20, 2010 | 07:12 AM
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Independent Rear Suspension?

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Old Dec 20, 2010 | 10:35 PM
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From: Tacoma, Wa
Car: '91 TA vert
Engine: turboLSx
Transmission: T56
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Re: Independent Rear Suspension?

https://www.thirdgen.org/forums/susp...uspension.html
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Old Dec 23, 2010 | 12:37 AM
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From: North Central Indiana
Car: 86 IROC
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Axle/Gears: 3.54 Dana 44 IRS
Re: Independent Rear Suspension?

Originally Posted by LS61990RS
Will a C4 or a C5 rear axle swap over to the third gen, if so, what all would i need for this swap.
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Old May 4, 2012 | 10:35 AM
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From: DAYTON OHIO
Car: 86 z28,89 iroc
Engine: 350 crate and ls1
Transmission: 700r4/4l60e
Axle/Gears: open diff stock/4th gen posi
Re: Independent Rear Suspension?

was there ever a factory irs rear built in third gens?
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Old May 4, 2012 | 11:07 AM
  #6  
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Independent Rear Suspension?

No
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Old May 4, 2012 | 12:09 PM
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From: Georgetown TX
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: Independent Rear Suspension?

The easiest way to have a C4/C5 IRS is to buy a running C4/C5 and just drive that.
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Old May 4, 2012 | 01:16 PM
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Car: White 84 z28
Engine: Chevy 350
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Re: Independent Rear Suspension?

heres another good thread

https://www.thirdgen.org/forums/fabr...-z06-long.html
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Old May 4, 2012 | 01:23 PM
  #9  
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From: Tacoma, Wa
Car: '91 TA vert
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Transmission: T56
Axle/Gears: 3.23
Re: Independent Rear Suspension?

Originally Posted by Base91
The easiest way to have a C4/C5 IRS is to buy a running C4/C5 and just drive that.
What's the fun in easy?
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Old May 4, 2012 | 01:51 PM
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From: NH
Car: 1967 Firebird P.T.
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Transmission: MN12 6 speed
Axle/Gears: 3.73 8.5" 10 Bolt Eaton
Re: Independent Rear Suspension?

Originally Posted by blue birdy 87
ive read that thread and i agree its very good but that is NOT a thread to be followed and attempted by an amateur builder. That guy is insane (in a very good way). The C4 IRS thread would be a better example of a potential attempt to convert to IRS.
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Old May 4, 2012 | 02:44 PM
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From: Bethlehem, CT
Car: 1983 Firebird SE
Engine: C5 LS1
Transmission: 6 speed
Axle/Gears: 3.42
Re: Independent Rear Suspension?

Yeah, 1meanz's build was a piece of cake..... NO??
Never thought I'd see something more involved, but the 3rd gen/ZO6 is.
Crazy, and talented- both of them.

IRS?? Go with a Watts or love what you got; that's my approach ;-)
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Old May 4, 2012 | 07:10 PM
  #12  
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Re: Independent Rear Suspension?

Originally Posted by 88FormulaKiller
ive read that thread and i agree its very good but that is NOT a thread to be followed and attempted by an amateur builder. That guy is insane (in a very good way). The C4 IRS thread would be a better example of a potential attempt to convert to IRS.
Just to be clear that guy is using the front suspension from the Z06, the rear is remaining a torque arm/live axle setup.

This guy is trying to put the transaxle and rear suspension from a c5, along with an LS1, in to his third gen.

https://www.thirdgen.org/forums/fabr...transaxle.html
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Old May 5, 2012 | 08:55 AM
  #13  
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From: North Central Indiana
Car: 86 IROC
Engine: 383
Transmission: TKO 600
Axle/Gears: 3.54 Dana 44 IRS
Re: Independent Rear Suspension?

Originally Posted by marokid
was there ever a factory irs rear built in third gens?
There was a GM test mule, a TA called Firefox, that had a C4 IRS installed. GM did it during development of the 4th gen. There is a link to pix and an article of the car in my build thread, but there are no pix of how GM installed the rear.
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Old May 11, 2012 | 03:11 AM
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Re: Independent Rear Suspension?

After looking through the pictures and reading all of the captions in that IRS install, it honestly doesn't look like it's worth it at all. I'd love to go GM IRS instead of trying to stuff a ford 9" in my car, but not at that expense. Without the expert skill of that fabricator, and the knowledge of suspension fabrication and angles an average mechanic would just end up destroying that car. Honestly I feel like they weren't far from it, and they finished successfully.

Long story short-stick do your solid rear or get a vette.
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Old May 6, 2013 | 06:48 PM
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From: Kalamazoo,MI
Car: 1985 IROC-Z
Engine: 350 TPI
Transmission: T5 manual
Re: Independent Rear Suspension?

http://www.gmhightechperformance.com...n/viewall.html
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