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9 bolt disc brakes swap

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Old 08-30-2009, 04:44 AM   #1
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Join Date: Apr 2009
Location: Oxford, NC
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Car: 1988 Camaro Iroc Z28
Engine: 5.7L TPI
Transmission: 700R
Axle/Gears: 4 Wheel Disc/ 2.77 Borg- Warner Pos

9 bolt disc brakes swap

OK Guys... I need help please. I have a 88 Iroc with the Borg-Warner axle with disc brakes. Can i swap the disc brakes from the 9 bolt to 2004 10 bolt exle???

My Borg-Warner rear axle is makeing a woring noise when driveing. I have checked the gear oil to find the oil was leaking out and had a very small amount of oil left in it. So i fix the leak and put in new oil plus the additive for Possy track rear ends.

I just got the car and fixing the bugs out of it. The 10 bolt rear end was bought from F-Bodys in Charrlott, NC. I believe they told me the 10 bolt was out of a 2004 Formla Firebid, but it haves the DRUM BRAKES.

So I thought to go ahead and swap rear ends out and put the disc brakes on. Am I makeing the right choise??????

Also... what is so specail about the Borg Warner rear ends?????
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Old 08-30-2009, 07:52 AM   #2
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Location: Lawrence, KS
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Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's


Re: 9 bolt disc brakes swap

Welcome to TGO.

You can't swap the disc to a drum rear without modification or Ed Miller's kit. Remember too that you'll need a disc proportioning valve, e-brake cables, and driven and/or driven gears to make the speedo rear correctly.

BTW, the flanges/backing plates are different between 9- and 10-bolts. Nine-bolt are a bit stronger, but parts are apparently difficult to come by. The following FAQ will provide more info on 10-bolts:

http://www.thirdgen.org/techboard/tr...-10-bolts.html

JamesC
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Last edited by JamesC; 09-01-2009 at 07:51 AM.
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Old 08-30-2009, 05:41 PM   #3
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Join Date: Jul 2007
Location: MA
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Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt

Re: 9 bolt disc brakes swap

Also the 4th gen rear is wider (but it will bolt in). Sounds like your 9 bolt needs a bearing kit. Might be easier in the long run to fix it.
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Old 09-01-2009, 02:53 AM   #4
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Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
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Axle/Gears: 9-bolt 3.70


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Re: 9 bolt disc brakes swap

Quote:
Originally Posted by JamesC View Post

BTW, the flanges/backing plates are between 9- and 10-bolts. Nine-bolt are a bit stronger, but parts are apparently difficult to come by.
Can you explain this a little better? Im not sure what you mean.
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Old 09-01-2009, 07:50 AM   #5
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Join Date: Aug 1999
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Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's


Re: 9 bolt disc brakes swap

Quote:
Originally Posted by InfernalVortex View Post
Can you explain this a little better? Im not sure what you mean.
Oops, my bad. Nine- and ten-bolt backing plates aren't interchangeable; the bolt pattern is different.

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