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Old 08-09-2009, 02:12 AM   #1
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Join Date: Oct 2007
Location: Wyoming
Posts: 1,257
Car: 1986 IROC-Z
Engine: LT1 383 Soon
Transmission: Built T-56 Soon
Axle/Gears: 4th Gen 10 Bolt Tru Trac 4.10 Soon

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4th gen rear end swap question
A few questions for anyone who knows. Does anyone know how much horsepower the 4th gen rear ends can handle? Is it the axles that are the main concern in a factory rear end, or does something else in it break first? I found a 4th gen rear with 3:23 ratio and FORGED Moser axles. I am wondering how well this would hold up to a 550 to 650 horsepower engine. Thanks guys!!
Last edited by New2Chevy; 08-09-2009 at 12:28 PM.
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Old 08-09-2009, 07:51 AM   #2
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Re: 4th gen rear end swap question
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Originally Posted by New2Chevy View Post
Does anyone know how much horsepower the 4th gen rear ends can handle? Thanks!
This isn't a specific answer to your question; however, the fourthgen rear will handle no more power than a thirdgen rear with 28-spline axles.

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Old 08-09-2009, 12:04 PM   #3
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Car: 1986 IROC-Z
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Re: 4th gen rear end swap question
Perhaps I need a Strange rear end, if I'm planning on making 530 to 650 horsepower at the crank, or would just having forged axles be the key?
Last edited by New2Chevy; 08-09-2009 at 12:29 PM.
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Old 08-09-2009, 07:12 PM   #4
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Car: 1986 Camaro
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Re: 4th gen rear end swap question
No. get the Strange rear. i have broken 2 junky 7.5 rears. One in my third gen with street tires and on in my 2000 SS M6 car. Don't waste your money on any 10 bolt for our cars. Go for a strange 12 bolt or S60.
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Old 08-10-2009, 12:21 AM   #5
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Re: 4th gen rear end swap question
I never saw the s60 before now. I just checked it out. Looks perfect. Do I need the abs thing with it, for an 86 IROC? If so, which do I need? I don't quite know what the 3 channel and 4 channel stuff is all about. Thanks guys, for your input.
Last edited by New2Chevy; 08-10-2009 at 03:35 AM.
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Old 08-15-2009, 03:39 PM   #6
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Re: 4th gen rear end swap question
you dont have ABS in your car so you wont need it.
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Old 08-15-2009, 03:39 PM
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