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Will a GM-12 and a GM-57 fit in my 87 iroc?

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Old Nov 21, 2007 | 08:17 PM
  #1  
87 IROC NC's Avatar
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Joined: Dec 2006
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From: North Carolina
Car: 1987 IROC-Z28
Engine: 305 TPI
Transmission: Auto
Will a GM-12 and a GM-57 fit in my 87 iroc?

My dad picked up an old 69 camaro that he is restoring to stock. The car had been used for drag racing before and has a GM-12 rear end and a GM-57 and tranny. Now the tranny in my 87 iroc is about to go and the rear end has a nasty leak.

So I guess my questions are:

Can I do this swap?
Will it improve performance?
Is it worth it?
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Old Nov 21, 2007 | 08:31 PM
  #2  
406maro's Avatar
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From: wichita falls, tx
Car: 1986 Camaro Berlinetta
Engine: 406 roller
Transmission: th 350
Axle/Gears: 4.10
Re: Will a GM-12 and a GM-57 fit in my 87 iroc?

The rearend will not fit.
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Old Nov 21, 2007 | 09:53 PM
  #3  
87 IROC NC's Avatar
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Junior Member
 
Joined: Dec 2006
Posts: 56
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From: North Carolina
Car: 1987 IROC-Z28
Engine: 305 TPI
Transmission: Auto
Re: Will a GM-12 and a GM-57 fit in my 87 iroc?

Originally Posted by 406maro
The rearend will not fit.
And I am assuming that the tranny will not bolt on to my existing rear end?
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Old Nov 21, 2007 | 09:54 PM
  #4  
Apeiron's Avatar
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Joined: Jan 2000
Posts: 20,981
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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: Will a GM-12 and a GM-57 fit in my 87 iroc?

No, but no tranny will.
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