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Which backing plates do I need?

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Old Nov 7, 2006 | 12:00 AM
  #1  
C&DPerformance's Avatar
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Joined: Sep 2004
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From: Columbia,TN
Car: 89 Formula 350
Engine: 355
Transmission: 700R4
Which backing plates do I need?

I have a 89 formula with a borg warner rear and pbr brakes. I have a 10 bolt housing from a 88 formula that is disc. Which backing plates do I need to swap the pbr calipers from the 9 bolt to the 10 bolt?
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Old Nov 7, 2006 | 05:28 AM
  #2  
JamesC's Avatar
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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
Originally Posted by C&DPerformance
Which backing plates do I need to swap the pbr calipers from the 9 bolt to the 10 bolt?
You require the ten-bolt backing plate (the nine-bolt has a different bolt pattern and won't fit the ten-bolt axel flanges). You can see the difference in the following link:

https://www.thirdgen.org/forums/faq-...iscs-89-a.html

JamesC
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Old Nov 7, 2006 | 07:36 AM
  #3  
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From: Elgin, IL
Car: 92 z28, 07 Silverado
Engine: LS1, 5.3
Transmission: T56
Axle/Gears: 3.73, 3.23
i had this same problem. I just drilled new holes in the backing plates and everything turned out fine.
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Old Nov 7, 2006 | 01:42 PM
  #4  
JamesC's Avatar
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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
Originally Posted by simz28
i had this same problem. I just drilled new holes in the backing plates and everything turned out fine.
I believe a few members have done the above, but with the plates readily available, the best solution, at least IMO, is to purchase new.

JamesC
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