9 Bolt backing plates
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Joined: Feb 2002
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From: Cambridge, Ontario, Canada
Car: 1990 GTA
Engine: L98 5.7 L
Transmission: 700R
Axle/Gears: 3.45 9 Bolt
9 Bolt backing plates
Hey all, I recently picked up a 3.45 9bolt. I am looking at swapping it into my 1990 GTA and I was told that I would need different backing plates in order to use my stock PBR brakes. Any info on this would be greatly appreciated. Where would I look for these? Thanks in advance...
Joined: Sep 2005
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: 9 Bolt backing plates
Yes that is correct. They are different from the far less uncommon 10-bolt ones. There are 2 types, conveniently known as "early" and "late". The "late" are considered "better".
I have no clue where to get them, other than off of a late 89 9-bolt. No one makes repops of them anymore, to my knowledge. I could be mistaken though.
Yes I have a set but they're not for sale.
I have no clue where to get them, other than off of a late 89 9-bolt. No one makes repops of them anymore, to my knowledge. I could be mistaken though.
Yes I have a set but they're not for sale.
Joined: Oct 2001
Posts: 12,214
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 9 Bolt backing plates
Iirc, i have seen 10 bolt brackets used on the 9bolt, just have to rotate it and drill new holes. Maybe even slot them.
i have 9bolt brackets on my big bearing 9inch
i have 9bolt brackets on my big bearing 9inch
Joined: Dec 1999
Posts: 3,544
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From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
Re: 9 Bolt backing plates
hawks and edmiller sell them they are just flat metal and don't have the slight offset so you may need washers to space the caliper bracket
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