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9bolt brakes to a 10 bolt

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Old Jun 30, 2008 | 11:07 AM
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From: Hollyrock MD
Car: 88 formula
Engine: 350 goin carb
Transmission: 700r4
9bolt brakes to a 10 bolt

i wanted to know if my disk brake setup (backingplates) will bolt up to a 10 bolt rear that has drum brakes. plase let me know
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Old Jun 30, 2008 | 02:12 PM
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From: St. Louis
Car: RS
Engine: LS1
Transmission: T56
Axle/Gears: 9" for the ladies
Re: 9bolt brakes to a 10 bolt

not without 10 bolt back plates.
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Old Jun 30, 2008 | 03:03 PM
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From: Hollyrock MD
Car: 88 formula
Engine: 350 goin carb
Transmission: 700r4
Re: 9bolt brakes to a 10 bolt

ok, so my 9 bolt backing plates will not fit onto the 10 bolt? if that is the case i will just leave the drums on there
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Old Jun 30, 2008 | 03:06 PM
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: 9bolt brakes to a 10 bolt

Originally Posted by 88tpi350
ok, so my 9 bolt backing plates will not fit onto the 10 bolt?
No, the bolt pattern is different. Furthermore, there's more to the conversion than just swapping the backing plates (the axel flanges are different). You might search Ed Miller, ebmiller88, who makes a kit that might interest you.

JamesC

Last edited by JamesC; Jun 30, 2008 at 03:10 PM.
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Old Jun 30, 2008 | 03:26 PM
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From: Hollyrock MD
Car: 88 formula
Engine: 350 goin carb
Transmission: 700r4
Re: 9bolt brakes to a 10 bolt

coll thanks.. long story short, i have all the parts to build a real nice 10bolt, thinking thats what i should have.. pulled rear to see i had a 9 bolt. i buddy has a 10 bolt with drums on it and i wanted to upgrade to disk without spending too much $$
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Old Jul 1, 2008 | 04:48 AM
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From: Roy,UT USA
Re: 9bolt brakes to a 10 bolt

I'm not 100% sure if the 9 bolt backing plates will work on the 10 bolt, but I know it works the other way around. We used 10 bolt backing plates on my buddy's 9 bolt rear. He blew up his 10 bolt, and the 9 bolt he had laying around didn't have any brakes on it, so we just adapted the 10 bolt discs to it. Had to router the mounting holes out a bit, but it wasn't hard to do, and worked out fine. I would imagine it'd work the other way around just as well. Since it's a drum rear, you'd also have to modify the flanges at the ends of the axle tubes. You have to cut off the part with the big hole where the line for the wheel cylinder goes through and drill the top two holes for the disc backing plate. There's a tech article on the main page that explains how to do this. None of these things are real difficult to do, but then again, it's much easier to just run the drums!
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Old Jul 1, 2008 | 06:18 AM
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: 9bolt brakes to a 10 bolt

Originally Posted by Pat Hall
Had to router the mounting holes out a bit, but it wasn't hard to do, and worked out fine. I would imagine it'd work the other way around just as well.
Here's a pic of the backing plate mounting holes for disc brakes. The old 9-bolt is on top of the new 10-bolt. Though I'd personally feel uncomfortable modding them, as Pat says, others have.

https://www.thirdgen.org/forums/atta...89-bplate1.jpg

JamesC
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